-21=4x-3(2x+15)

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Solution for -21=4x-3(2x+15) equation: 



-21=4x-3(2x+15)

We move all terms to the left:

-21-(4x-3(2x+15))=0



We calculate terms in parentheses: -(4x-3(2x+15)), so:

4x-3(2x+15)

We multiply parentheses

4x-6x-45

We add all the numbers together, and all the variables

-2x-45

Back to the equation:

-(-2x-45)



We get rid of parentheses

2x+45-21=0

We add all the numbers together, and all the variables

2x+24=0

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

2x=-24

x=-24/2

x=-12

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