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12.16+0.13(x+3)=12.66-0.07x
We move all terms to the left:
12.16+0.13(x+3)-(12.66-0.07x)=0
We add all the numbers together, and all the variables
0.13(x+3)-(-0.07x+12.66)+12.16=0
We multiply parentheses
0.13x-(-0.07x+12.66)+0.39+12.16=0
We get rid of parentheses
0.13x+0.07x-12.66+0.39+12.16=0
We add all the numbers together, and all the variables
0.2x-0.11=0
We move all terms containing x to the left, all other terms to the right
0.2x=0.11
x=0.11/0.2
x=0.11/0.2
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