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80=7x+9
We move all terms to the left:
80-(7x+9)=0
We get rid of parentheses
-7x-9+80=0
We add all the numbers together, and all the variables
-7x+71=0
We move all terms containing x to the left, all other terms to the right
-7x=-71
x=-71/-7
x=10+1/7
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