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5x+8=7x-72=
We move all terms to the left:
5x+8-(7x-72)=0
We get rid of parentheses
5x-7x+72+8=0
We add all the numbers together, and all the variables
-2x+80=0
We move all terms containing x to the left, all other terms to the right
-2x=-80
x=-80/-2
x=+40
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