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-5-8x=-7x+21
We move all terms to the left:
-5-8x-(-7x+21)=0
We get rid of parentheses
-8x+7x-21-5=0
We add all the numbers together, and all the variables
-1x-26=0
We move all terms containing x to the left, all other terms to the right
-x=26
x=26/-1
x=-26
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