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85x+7=100x-12
We move all terms to the left:
85x+7-(100x-12)=0
We get rid of parentheses
85x-100x+12+7=0
We add all the numbers together, and all the variables
-15x+19=0
We move all terms containing x to the left, all other terms to the right
-15x=-19
x=-19/-15
x=1+4/15
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