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100-8x=80-4x
We move all terms to the left:
100-8x-(80-4x)=0
We add all the numbers together, and all the variables
-8x-(-4x+80)+100=0
We get rid of parentheses
-8x+4x-80+100=0
We add all the numbers together, and all the variables
-4x+20=0
We move all terms containing x to the left, all other terms to the right
-4x=-20
x=-20/-4
x=+5
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