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3x+36=13x-42
We move all terms to the left:
3x+36-(13x-42)=0
We get rid of parentheses
3x-13x+42+36=0
We add all the numbers together, and all the variables
-10x+78=0
We move all terms containing x to the left, all other terms to the right
-10x=-78
x=-78/-10
x=7+4/5
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