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x+15=4x-39
We move all terms to the left:
x+15-(4x-39)=0
We get rid of parentheses
x-4x+39+15=0
We add all the numbers together, and all the variables
-3x+54=0
We move all terms containing x to the left, all other terms to the right
-3x=-54
x=-54/-3
x=+18
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