3x+8=5x-4=90

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Solution for 3x+8=5x-4=90 equation: 



3x+8=5x-4=90

We move all terms to the left:

3x+8-(5x-4)=0

We get rid of parentheses

3x-5x+4+8=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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