1) \(70-5\left(x-3\right)=45\)
\(5\left(x-3\right)=70-45\)
\(5\left(x-3\right)=25\)
\(x-3=25:5\)
\(x-3=5\)
\(x=5+3\)
\(x=8\)
2) \(10+2x=4^5:4^3\)
\(10+2x=4^2\)
\(10+2x=16\)
\(2x=16-10\)
\(2x=6\)
\(x=6:2\)
\(x=3\)
3) \(12+\left(5+x\right)=20\)
\(5+x=20-12\)
\(5+x=8\)
\(x=8-5\)
\(x=3\)
4) \(14x+54=82\)
\(14x=82-54\)
\(14x=28\)
\(x=28:14\)
\(x=2\)
5) \(130-\left(100+x\right)=25\)
\(100+x=130-25\)
\(100+x=105\)
\(x=105-100\)
\(x=5\)
6) \(15x-133=17\)
\(15x=17+133\)
\(15x=150\)
\(x=150:15\)
\(x=10\)
7) \(5.2^2+\left(x+3\right)=5^2\)
\(5.4+\left(x+3\right)=25\)
\(20+\left(x+3\right)=25\)
\(x+3=25-20\)
\(x+3=5\)
\(x=5-3\)
\(x=2\)
8) \(5x-5^2=10\)
\(5x-25=10\)
\(5x=10+25\)
\(5x=35\)
\(x=35:5\)
\(x=7\)
9) \(2^3+\left(x-3^2\right)=5^3-4^3\)
\(8+\left(x-9\right)=125-64\)
\(8+\left(x-9\right)=61\)
\(x-9=61-8\)
\(x-9=53\)
\(x=53+9\)
\(x=62\)
1: =>5(x-3)=25
=>x-3=5
=>x=8
2: =>2x+10=16
=>2x=6
=>x=3
3: =>x+5=8
=>x=3
4: =>14x=28
=>x=2
5: =>x+100=105
=>x=5
6: =>15x=150
=>x=10
