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7x-9=-4x+90=
We move all terms to the left:
7x-9-(-4x+90)=0
We get rid of parentheses
7x+4x-90-9=0
We add all the numbers together, and all the variables
11x-99=0
We move all terms containing x to the left, all other terms to the right
11x=99
x=99/11
x=9
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