X+12+4x+3=90

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Solution for X+12+4x+3=90 equation: 



X+12+4X+3=90

We move all terms to the left:

X+12+4X+3-(90)=0

We add all the numbers together, and all the variables

5X-75=0

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

5X=75

X=75/5

X=15

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