X+(3x+18)=90

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Solution for X+(3x+18)=90 equation: 



X+(3X+18)=90

We move all terms to the left:

X+(3X+18)-(90)=0

We get rid of parentheses

X+3X+18-90=0

We add all the numbers together, and all the variables

4X-72=0

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

4X=72

X=72/4

X=18

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