`1)`
`25 -5 (4+x)=15`
`=> 5 (4+x)=25 -15`
`=> 5 (4+x)=10`
`=>4+x=10:5`
`=>4+x=2`
`=>x=2-4`
`=>x=-2`
`2)`
`250 - 10 ( 24 - 3x ) : 15 = 244`
`=> 10 ( 24 - 3x ) : 15 = 250 - 244`
`=> 10 ( 24 - 3x ) : 15 = 6`
`=> 10 ( 24 - 3x )= 6.15`
`=> 10 ( 24 - 3x )= 90`
`=> 24 - 3x = 90 :10`
`=> 24 - 3x =9`
`=> 3x=24 - 9`
`=>3x= 15`
`=>x=15:3`
`=>x=5`
`3)`
`120+2(8x-17)=214`
`=> 2(8x-17)=214-120`
`=> 2(8x-17)=94`
`=> 8x-17= 94 : 2`
`=> 8x-17=47`
`=> 8x=47 + 17`
`=>8x= 64`
`=>x=64:8`
`=>x=8`
`4)`
`740:(x+10)= 10^2-2.13`
`=> 740:(x+10)=100- 26`
`=> 740:(x+10)=74`
`=>x+10=740:74`
`=>x+10=10`
`=>x=10-10`
`=>x=0`
`5)`
`(19x+2.5^2) :14 = (13-8)^2 -4`
`=> (19x+2.25) :14 =25-4`
`=> (19x+50) :14 =21`
`=> 19x+50=21.14`
`=> 19x+50=294`
`=> 19x=294 - 50`
`=>19x=244`
`=>x=244:19`
`=>x=244/19`
1) \(25-5\left(4+x\right)=15\)
\(5\left(4+x\right)=25-15\)
\(5\left(4+x\right)=10\)
\(4+x=\dfrac{10}{5}\)
\(4+x=2\)
\(x=2-4\)
`=>x=-2`
2) \(250-10\left(24-3x\right):15=244\)
\(10\left(24-3x\right):15=250-244\)
\(10\left(24-3x\right):15=6\)
\(10\left(24-3x\right)=6\cdot15\)
\(10\left(24-3x\right)=90\)
\(24-3x=\dfrac{90}{10}=9\)
\(3x=24-9=15\)
\(x=\dfrac{15}{3}\)
`=>x=5`
3) \(120+2\left(8x-17\right)=214\)
\(2\left(8x-17\right)=214-120\)
\(2\left(8x-17\right)=94\)
\(8x-17=\dfrac{94}{2}\)
\(8x-17=47\)
\(8x=64\)
`=>x=64/8=8`
4) \(740:\left(x+10\right)=10^2-2\cdot13\)
\(740:\left(x+10\right)=100-26\)
\(740:\left(x+10\right)=74\)
\(x+10=\dfrac{740}{74}\)
\(x+10=10\)
`=>x=10-10=0`
5) \(\left(19x+2\cdot5^2\right):14=\left(13-8\right)^2-4\)
\(\left(19x+2\cdot25\right):14=5^2-4\)
\(\left(19x+50\right):14=25-4=21\)
\(19x+50=21\cdot14\)
\(19x+50=294\)
\(19x=294-50\)
\(19x=244\)
`=>x=244/19`
6) \(15\left(x+2\right)=\left(3^3+3\right):10\)
\(15\left(x+2\right)=\dfrac{30}{10}\)
\(15\left(x+2\right)=3\)
\(x+2=3:15=\dfrac{3}{15}=\dfrac{1}{5}\)
\(x=\dfrac{1}{5}-2\)
\(x=\dfrac{1}{5}-\dfrac{10}{5}\)
`=>x=-9/5`
7) \(\left(15+x\right):3=3^{15}:3^{12}\)
\(\left(15+x\right):3=3^3\)
\(15+x=3^3\cdot3\)
\(15+x=3^4=81\)
\(x=81-15\)
`=>x=66`
