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12.65+0.12(x+3)=13.40-0.08x
We move all terms to the left:
12.65+0.12(x+3)-(13.40-0.08x)=0
We add all the numbers together, and all the variables
0.12(x+3)-(-0.08x+13.4)+12.65=0
We multiply parentheses
0.12x-(-0.08x+13.4)+0.36+12.65=0
We get rid of parentheses
0.12x+0.08x-13.4+0.36+12.65=0
We add all the numbers together, and all the variables
0.2x-0.39=0
We move all terms containing x to the left, all other terms to the right
0.2x=0.39
x=0.39/0.2
x=1+0.19/0.2
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