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7x+3.5+2x+10=90
We move all terms to the left:
7x+3.5+2x+10-(90)=0
We add all the numbers together, and all the variables
9x-76.5=0
We move all terms containing x to the left, all other terms to the right
9x=76.5
x=76.5/9
x=8+3/6
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