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5x+15=8x-42
We move all terms to the left:
5x+15-(8x-42)=0
We get rid of parentheses
5x-8x+42+15=0
We add all the numbers together, and all the variables
-3x+57=0
We move all terms containing x to the left, all other terms to the right
-3x=-57
x=-57/-3
x=+19
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