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8*2x+x=90
We move all terms to the left:
8*2x+x-(90)=0
We add all the numbers together, and all the variables
x+8*2x-90=0
Wy multiply elements
x+16x-90=0
We add all the numbers together, and all the variables
17x-90=0
We move all terms containing x to the left, all other terms to the right
17x=90
x=90/17
x=5+5/17
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