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8x+7=2x+28
We move all terms to the left:
8x+7-(2x+28)=0
We get rid of parentheses
8x-2x-28+7=0
We add all the numbers together, and all the variables
6x-21=0
We move all terms containing x to the left, all other terms to the right
6x=21
x=21/6
x=3+1/2
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