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5x+1=8x+-20
We move all terms to the left:
5x+1-(8x+-20)=0
We add all the numbers together, and all the variables
5x-(8x-20)+1=0
We get rid of parentheses
5x-8x+20+1=0
We add all the numbers together, and all the variables
-3x+21=0
We move all terms containing x to the left, all other terms to the right
-3x=-21
x=-21/-3
x=+7
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