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4x+83=8x-9
We move all terms to the left:
4x+83-(8x-9)=0
We get rid of parentheses
4x-8x+9+83=0
We add all the numbers together, and all the variables
-4x+92=0
We move all terms containing x to the left, all other terms to the right
-4x=-92
x=-92/-4
x=+23
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