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12.37+0.07(x+3)=13.12-0.08x
We move all terms to the left:
12.37+0.07(x+3)-(13.12-0.08x)=0
We add all the numbers together, and all the variables
0.07(x+3)-(-0.08x+13.12)+12.37=0
We multiply parentheses
0.07x-(-0.08x+13.12)+0.21+12.37=0
We get rid of parentheses
0.07x+0.08x-13.12+0.21+12.37=0
We add all the numbers together, and all the variables
0.15x-0.54=0
We move all terms containing x to the left, all other terms to the right
0.15x=0.54
x=0.54/0.15
x=3+0.09/0.15
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