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0.10(x+120)=0.12x+10
We move all terms to the left:
0.10(x+120)-(0.12x+10)=0
We multiply parentheses
0.1x-(0.12x+10)+12=0
We get rid of parentheses
0.1x-0.12x-10+12=0
We add all the numbers together, and all the variables
-0.02x+2=0
We move all terms containing x to the left, all other terms to the right
-0.02x=-2
x=-2/-0.02
x=+100
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