3 x ( X -18) +23 = 59
3 x ( X -18 ) = 59 - 23
3 x ( X - 18) = 36
X - 18 = 36 : 3
X - 18 = 12
X = 12 + 18
X = 30
k nha
3x(x-180+23=59
3x-18=59-23
3x-18=36
3x=36+18
3x=54
x=54:3
x=18
Vậy x=18
\(3\left(x-18\right)+23=59\)
\(3\left(x-18\right)=36\)
\(x-18=12\)
\(x=30\)