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29x-7=21x-70
We move all terms to the left:
29x-7-(21x-70)=0
We get rid of parentheses
29x-21x+70-7=0
We add all the numbers together, and all the variables
8x+63=0
We move all terms containing x to the left, all other terms to the right
8x=-63
x=-63/8
x=-7+7/8
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