(7x+31)+(21x-19)=90

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Solution for (7x+31)+(21x-19)=90 equation: 



(7x+31)+(21x-19)=90

We move all terms to the left:

(7x+31)+(21x-19)-(90)=0

We get rid of parentheses

7x+21x+31-19-90=0

We add all the numbers together, and all the variables

28x-78=0

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

28x=78

x=78/28

x=2+11/14

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