7x-31=4x+5=90

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Solution for 7x-31=4x+5=90 equation: 



7x-31=4x+5=90

We move all terms to the left:

7x-31-(4x+5)=0

We get rid of parentheses

7x-4x-5-31=0

We add all the numbers together, and all the variables

3x-36=0

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

3x=36

x=36/3

x=12

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