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8x-77=3x+28
We move all terms to the left:
8x-77-(3x+28)=0
We get rid of parentheses
8x-3x-28-77=0
We add all the numbers together, and all the variables
5x-105=0
We move all terms containing x to the left, all other terms to the right
5x=105
x=105/5
x=21
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