(x+40)+(3x+20)=90

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Solution for (x+40)+(3x+20)=90 equation: 



(x+40)+(3x+20)=90

We move all terms to the left:

(x+40)+(3x+20)-(90)=0

We get rid of parentheses

x+3x+40+20-90=0

We add all the numbers together, and all the variables

4x-30=0

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

4x=30

x=30/4

x=7+1/2

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