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1500=1200+10x-120
We move all terms to the left:
1500-(1200+10x-120)=0
We add all the numbers together, and all the variables
-(10x+1080)+1500=0
We get rid of parentheses
-10x-1080+1500=0
We add all the numbers together, and all the variables
-10x+420=0
We move all terms containing x to the left, all other terms to the right
-10x=-420
x=-420/-10
x=+42
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