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89=4x+5x+8
We move all terms to the left:
89-(4x+5x+8)=0
We add all the numbers together, and all the variables
-(9x+8)+89=0
We get rid of parentheses
-9x-8+89=0
We add all the numbers together, and all the variables
-9x+81=0
We move all terms containing x to the left, all other terms to the right
-9x=-81
x=-81/-9
x=+9
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