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12.5+0.13x=12.90-0.12x
We move all terms to the left:
12.5+0.13x-(12.90-0.12x)=0
We add all the numbers together, and all the variables
0.13x-(-0.12x+12.9)+12.5=0
We get rid of parentheses
0.13x+0.12x-12.9+12.5=0
We add all the numbers together, and all the variables
0.25x-0.4=0
We move all terms containing x to the left, all other terms to the right
0.25x=0.4
x=0.4/0.25
x=1+0.15/0.25
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