15: =>-3x+7-9+x=0
=>-2x-2=0
=>2x+2=0
=>x=-1
17: =>5x-7=2x+2
=>3x=9
=>x=3
16: =>-2x+3+5x-12=0
=>3x-9=0
=>x=3
13: =>-3x+5-2x-11=0
=>-5x-6=0
=>x=-6/5
12: =>4x-9x=15+5
=>-5x=20
=>x=-4
11: =>5x=9
=>x=9/5
10: =>-2x-4x=-5-11
=>-6x=-16
=>x=8/3
\(10,11-2x=4x-5\)
\(\Leftrightarrow-2x-4x=-5-11\)
\(\Leftrightarrow-6x=-16\)
\(\Leftrightarrow x=\dfrac{8}{3}\)
\(11,2x+3=12-3x\)
\(\Leftrightarrow2x+3x=12-3\)
\(\Leftrightarrow5x=9\)
\(\Leftrightarrow x=\dfrac{9}{5}\)
\(12,4x-5=15x+9\)
\(\Leftrightarrow4x-15x=9+5\)
\(\Leftrightarrow-11x=14\)
\(\Leftrightarrow x=-\dfrac{14}{11}\)
\(13,5-3x=11+2x\)
\(\Leftrightarrow-3x-2x=11-5\)
\(\Leftrightarrow-5x=6\)
\(\Leftrightarrow x=-\dfrac{6}{5}\)
\(14,6x+12=3x-5\)
\(\Leftrightarrow6x-3x=-5-12\)
\(\Leftrightarrow3x=-17\)
\(\Leftrightarrow x=-\dfrac{17}{3}\)
\(15,7-3x=9-x\)
\(\Leftrightarrow-3x+x=9-7\)
\(\Leftrightarrow-2x=2\)
\(\Leftrightarrow x=-1\)
\(16,-2x+3=12-5x\)
\(\Leftrightarrow-2x+5x=12-3\)
\(\Leftrightarrow3x=9\)
\(\Leftrightarrow x=3\)
\(17,2\left(x+1\right)=5x-7\)
\(\Leftrightarrow2x+2-5x+7=0\)
\(\Leftrightarrow-3x=-9\)
\(\Leftrightarrow x=3\)
10
`11-2x=4x-5`
`<=>-2x-4x=-5-11`
`<=>-6x=-16`
`<=>x=8/3`
11)
`2x+3=12-3x`
`<=>2x+3x=12-3`
`<=>5x=9`
`<=>x=9/5`
12)
`4x-5=15+9x`
`<=>4x-9x=15+5`
`<=>-5x=20`
`<=>x=-4`
13)
`5-3x=11+2x`
`<=>-3x-2x=11-5`
`<=>-5x=6`
`<=>x=-6/5`
14)
`6x+12=3x-5`
`<=>6x-3x=-5-12`
`<=>3x=-17`
`<=>x=-17/3`
15)
`7-3x=9-x`
`<=>-3x+x=9-7
`<=>-2x=2`
`<=>x=-1`
16)
`-2x+3=12-5x`
`<=>-2x+5x=12-3`
`<=>3x=9`
`<=>x=3`
17)
`2(x+1)=5x-7`
`<=>2x+2=5x-7`
`<=>2x-5x=-7+2`
`<=>-3x=-5`
`<=>x=5/3`
