X+42+3x=90

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Solution for X+42+3x=90 equation: 



X+42+3X=90

We move all terms to the left:

X+42+3X-(90)=0

We add all the numbers together, and all the variables

4X-48=0

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

4X=48

X=48/4

X=12

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