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80+45x=80x+45
We move all terms to the left:
80+45x-(80x+45)=0
We get rid of parentheses
45x-80x-45+80=0
We add all the numbers together, and all the variables
-35x+35=0
We move all terms containing x to the left, all other terms to the right
-35x=-35
x=-35/-35
x=1
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