(3x)+(4x)=(x+90)

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Solution for (3x)+(4x)=(x+90) equation: 



(3x)+(4x)=(x+90)

We move all terms to the left:

(3x)+(4x)-((x+90))=0

We add all the numbers together, and all the variables

7x-((x+90))=0



We calculate terms in parentheses: -((x+90)), so:

(x+90)

We get rid of parentheses

x+90

Back to the equation:

-(x+90)



We get rid of parentheses

7x-x-90=0

We add all the numbers together, and all the variables

6x-90=0

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

6x=90

x=90/6

x=15

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