Question

3 .( x - 2 ) - ( 1 - x ) = 13

Answer 1

$3(x-2)-(1-x)=13\\3x-6-1+x=13\\4x=13+6+1\\4x=20\\x= \frac{20}{4} \\x=5$

Answer 2

3 .( x - 2 ) - ( 1 - x ) = 13
3x -6 -1 +x = 13
3x  +x = 13 +6 +1
4x= 20
x= 20/4
x=5