21=4x+(-x+15)

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Solution for 21=4x+(-x+15) equation: 



21=4x+(-x+15)

We move all terms to the left:

21-(4x+(-x+15))=0

We add all the numbers together, and all the variables

-(4x+(-1x+15))+21=0



We calculate terms in parentheses: -(4x+(-1x+15)), so:

4x+(-1x+15)

We get rid of parentheses

4x-1x+15

We add all the numbers together, and all the variables

3x+15

Back to the equation:

-(3x+15)



We get rid of parentheses

-3x-15+21=0

We add all the numbers together, and all the variables

-3x+6=0

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

-3x=-6

x=-6/-3

x=+2

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