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

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



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

We move all terms to the left:

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



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

3(4x+4)

We multiply parentheses

12x+12

Back to the equation:

-(12x+12)



We get rid of parentheses

15x-12x-12+21=0

We add all the numbers together, and all the variables

3x+9=0

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

3x=-9

x=-9/3

x=-3

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