X+30=3x-90

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Solution for X+30=3x-90 equation: 



X+30=3X-90

We move all terms to the left:

X+30-(3X-90)=0

We get rid of parentheses

X-3X+90+30=0

We add all the numbers together, and all the variables

-2X+120=0

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

-2X=-120

X=-120/-2

X=+60

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