5X+12=2×(X+15)
5x-2x=30-12
3x=18
x=6
7×(3+X)-12=5X+88
7x-5x=88+12-21
2x=79
x=39.5
(9.7+2X)÷2=(5.5+5X)÷3
3× (9.7+2X)=2×(5.5+5X)
6x+29.1=11+10x
10x-6x=29.1-11
4x=28.1
x=7.025
5X+12=2×(X+15)
5x-2x=30-12
3x=18
x=6
7×(3+X)-12=5X+88
7x-5x=88+12-21
2x=79
x=39.5
(9.7+2X)÷2=(5.5+5X)÷3
3× (9.7+2X)=2×(5.5+5X)
6x+29.1=11+10x
10x-6x=29.1-11
4x=28.1
x=7.025