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80+4x+5=12x-11
We move all terms to the left:
80+4x+5-(12x-11)=0
We add all the numbers together, and all the variables
4x-(12x-11)+85=0
We get rid of parentheses
4x-12x+11+85=0
We add all the numbers together, and all the variables
-8x+96=0
We move all terms containing x to the left, all other terms to the right
-8x=-96
x=-96/-8
x=+12
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