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12.89+0.08(x+3)=13.39-0.13x
We move all terms to the left:
12.89+0.08(x+3)-(13.39-0.13x)=0
We add all the numbers together, and all the variables
0.08(x+3)-(-0.13x+13.39)+12.89=0
We multiply parentheses
0.08x-(-0.13x+13.39)+0.24+12.89=0
We get rid of parentheses
0.08x+0.13x-13.39+0.24+12.89=0
We add all the numbers together, and all the variables
0.21x-0.26=0
We move all terms containing x to the left, all other terms to the right
0.21x=0.26
x=0.26/0.21
x=1+0.05/0.21
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