13x-5=7x+31=90

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Solution for 13x-5=7x+31=90 equation: 



13x-5=7x+31=90

We move all terms to the left:

13x-5-(7x+31)=0

We get rid of parentheses

13x-7x-31-5=0

We add all the numbers together, and all the variables

6x-36=0

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

6x=36

x=36/6

x=6

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