(x+40)+(3x-10)=90

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Solution for (x+40)+(3x-10)=90 equation: 



(x+40)+(3x-10)=90

We move all terms to the left:

(x+40)+(3x-10)-(90)=0

We get rid of parentheses

x+3x+40-10-90=0

We add all the numbers together, and all the variables

4x-60=0

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

4x=60

x=60/4

x=15

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