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9x-11+4x+1+7x-3=90
We move all terms to the left:
9x-11+4x+1+7x-3-(90)=0
We add all the numbers together, and all the variables
20x-103=0
We move all terms containing x to the left, all other terms to the right
20x=103
x=103/20
x=5+3/20
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