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80-3x=5x+8x
We move all terms to the left:
80-3x-(5x+8x)=0
We add all the numbers together, and all the variables
-3x-(+13x)+80=0
We get rid of parentheses
-3x-13x+80=0
We add all the numbers together, and all the variables
-16x+80=0
We move all terms containing x to the left, all other terms to the right
-16x=-80
x=-80/-16
x=+5
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