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6x+42=-2x-25
We move all terms to the left:
6x+42-(-2x-25)=0
We get rid of parentheses
6x+2x+25+42=0
We add all the numbers together, and all the variables
8x+67=0
We move all terms containing x to the left, all other terms to the right
8x=-67
x=-67/8
x=-8+3/8
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