x+21=4(x-3)

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



x+21=4(x-3)

We move all terms to the left:

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



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

4(x-3)

We multiply parentheses

4x-12

Back to the equation:

-(4x-12)



We get rid of parentheses

x-4x+12+21=0

We add all the numbers together, and all the variables

-3x+33=0

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

-3x=-33

x=-33/-3

x=+11

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