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12.15+0.12(x+3)=12.85-0.09x
We move all terms to the left:
12.15+0.12(x+3)-(12.85-0.09x)=0
We add all the numbers together, and all the variables
0.12(x+3)-(-0.09x+12.85)+12.15=0
We multiply parentheses
0.12x-(-0.09x+12.85)+0.36+12.15=0
We get rid of parentheses
0.12x+0.09x-12.85+0.36+12.15=0
We add all the numbers together, and all the variables
0.21x-0.34=0
We move all terms containing x to the left, all other terms to the right
0.21x=0.34
x=0.34/0.21
x=1+0.13/0.21
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