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90+9x=98+8x
We move all terms to the left:
90+9x-(98+8x)=0
We add all the numbers together, and all the variables
9x-(8x+98)+90=0
We get rid of parentheses
9x-8x-98+90=0
We add all the numbers together, and all the variables
x-8=0
We move all terms containing x to the left, all other terms to the right
x=8
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