(3x-30)+x=90

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Solution for (3x-30)+x=90 equation: 



(3x-30)+x=90

We move all terms to the left:

(3x-30)+x-(90)=0

We add all the numbers together, and all the variables

x+(3x-30)-90=0

We get rid of parentheses

x+3x-30-90=0

We add all the numbers together, and all the variables

4x-120=0

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

4x=120

x=120/4

x=30

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