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12.47+0.09(x+9)=13.22-0.13x
We move all terms to the left:
12.47+0.09(x+9)-(13.22-0.13x)=0
We add all the numbers together, and all the variables
0.09(x+9)-(-0.13x+13.22)+12.47=0
We multiply parentheses
0.09x-(-0.13x+13.22)+0.81+12.47=0
We get rid of parentheses
0.09x+0.13x-13.22+0.81+12.47=0
We add all the numbers together, and all the variables
0.22x+0.06=0
We move all terms containing x to the left, all other terms to the right
0.22x=-0.06
x=-0.06/0.22
x=-0.06/0.22
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