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-79(x+8)=21
We move all terms to the left:
-79(x+8)-(21)=0
We multiply parentheses
-79x-632-21=0
We add all the numbers together, and all the variables
-79x-653=0
We move all terms containing x to the left, all other terms to the right
-79x=653
x=653/-79
x=-8+21/79
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