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42x+12=5x-3
We move all terms to the left:
42x+12-(5x-3)=0
We get rid of parentheses
42x-5x+3+12=0
We add all the numbers together, and all the variables
37x+15=0
We move all terms containing x to the left, all other terms to the right
37x=-15
x=-15/37
x=-15/37
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