X+3+20x=90

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Solution for X+3+20x=90 equation: 



X+3+20X=90

We move all terms to the left:

X+3+20X-(90)=0

We add all the numbers together, and all the variables

21X-87=0

We move all terms containing X to the left, all other terms to the right

21X=87

X=87/21

X=4+1/7

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