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45=80-4x
We move all terms to the left:
45-(80-4x)=0
We add all the numbers together, and all the variables
-(-4x+80)+45=0
We get rid of parentheses
4x-80+45=0
We add all the numbers together, and all the variables
4x-35=0
We move all terms containing x to the left, all other terms to the right
4x=35
x=35/4
x=8+3/4
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