(x-20)+(3x+6)=90

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Solution for (x-20)+(3x+6)=90 equation: 



(x-20)+(3x+6)=90

We move all terms to the left:

(x-20)+(3x+6)-(90)=0

We get rid of parentheses

x+3x-20+6-90=0

We add all the numbers together, and all the variables

4x-104=0

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

4x=104

x=104/4

x=26

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