x+(3x+20)=90

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



x+(3x+20)=90

We move all terms to the left:

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

We get rid of parentheses

x+3x+20-90=0

We add all the numbers together, and all the variables

4x-70=0

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

4x=70

x=70/4

x=17+1/2

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