3.1(2-x)+4.5=7.2-4.3(-3.7+x)

3.1(2-x)+4.5=7.2-4.3(-3.7+x)
6.2-3.1x+4.5=7.2+15.91-4.3x
10.7-3.1x=23.11-4.3x
3.1x+4.3x=23.11-10.7
12x=12.41
×=12.41÷12
×=12.41/100:12/10
x=12.41/100×10/12
x=12.41/10×1/12
x=12.41/120