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7x-23=-4x+21
We move all terms to the left:
7x-23-(-4x+21)=0
We get rid of parentheses
7x+4x-21-23=0
We add all the numbers together, and all the variables
11x-44=0
We move all terms containing x to the left, all other terms to the right
11x=44
x=44/11
x=4
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