X+5=3x-7=90

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Solution for X+5=3x-7=90 equation: 



X+5=3X-7=90

We move all terms to the left:

X+5-(3X-7)=0

We get rid of parentheses

X-3X+7+5=0

We add all the numbers together, and all the variables

-2X+12=0

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

-2X=-12

X=-12/-2

X=+6

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