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X+5*4X=90
We move all terms to the left:
X+5*4X-(90)=0
Wy multiply elements
X+20X-90=0
We add all the numbers together, and all the variables
21X-90=0
We move all terms containing X to the left, all other terms to the right
21X=90
X=90/21
X=4+2/7
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