Question

2.(x-51)=2.2³+20

70-5.(x-3)=45

Answer 1

\(2\times\left(x-51\right)=2\times2^3+20\)

\(2\times\left(x-51\right)=2^4+20\)

\(2\times\left(x-51\right)=16+20\)

\(2\times\left(x-51\right)=36\)

\(x-51=36:2\)

\(x-51=18\)

\(x=18+51\)

\(x=69.\)

\(70-5\times\left(x-3\right)=45\)

\(5\times\left(x-3\right)=70-45\)

\(5\times\left(x-3\right)=25\)

\(x-3=25:5\)

\(x-3=5\)

\(x=5+3\)

\(x=8.\)