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6x+12=75x+20
We move all terms to the left:
6x+12-(75x+20)=0
We get rid of parentheses
6x-75x-20+12=0
We add all the numbers together, and all the variables
-69x-8=0
We move all terms containing x to the left, all other terms to the right
-69x=8
x=8/-69
x=-8/69
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