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7x+4x+5x-3+9=90
We move all terms to the left:
7x+4x+5x-3+9-(90)=0
We add all the numbers together, and all the variables
16x-84=0
We move all terms containing x to the left, all other terms to the right
16x=84
x=84/16
x=5+1/4
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