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7x-21=-2x-29
We move all terms to the left:
7x-21-(-2x-29)=0
We get rid of parentheses
7x+2x+29-21=0
We add all the numbers together, and all the variables
9x+8=0
We move all terms containing x to the left, all other terms to the right
9x=-8
x=-8/9
x=-8/9
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