90=4x+(x-15)

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Solution for 90=4x+(x-15) equation: 



90=4x+(x-15)

We move all terms to the left:

90-(4x+(x-15))=0



We calculate terms in parentheses: -(4x+(x-15)), so:

4x+(x-15)

We get rid of parentheses

4x+x-15

We add all the numbers together, and all the variables

5x-15

Back to the equation:

-(5x-15)



We get rid of parentheses

-5x+15+90=0

We add all the numbers together, and all the variables

-5x+105=0

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

-5x=-105

x=-105/-5

x=+21

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