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89=6x-7x=
We move all terms to the left:
89-(6x-7x)=0
We add all the numbers together, and all the variables
-(-1x)+89=0
We get rid of parentheses
1x+89=0
We add all the numbers together, and all the variables
x+89=0
We move all terms containing x to the left, all other terms to the right
x=-89
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