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10x+7=5x+125x+12
We move all terms to the left:
10x+7-(5x+125x+12)=0
We add all the numbers together, and all the variables
10x-(130x+12)+7=0
We get rid of parentheses
10x-130x-12+7=0
We add all the numbers together, and all the variables
-120x-5=0
We move all terms containing x to the left, all other terms to the right
-120x=5
x=5/-120
x=-1/24
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