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12.81+0.07(x+3)=13.31-0.15x
We move all terms to the left:
12.81+0.07(x+3)-(13.31-0.15x)=0
We add all the numbers together, and all the variables
0.07(x+3)-(-0.15x+13.31)+12.81=0
We multiply parentheses
0.07x-(-0.15x+13.31)+0.21+12.81=0
We get rid of parentheses
0.07x+0.15x-13.31+0.21+12.81=0
We add all the numbers together, and all the variables
0.22x-0.29=0
We move all terms containing x to the left, all other terms to the right
0.22x=0.29
x=0.29/0.22
x=1+0.07/0.22
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