X+21=4(x+15)

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



X+21=4(X+15)

We move all terms to the left:

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



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

4(X+15)

We multiply parentheses

4X+60

Back to the equation:

-(4X+60)



We get rid of parentheses

X-4X-60+21=0

We add all the numbers together, and all the variables

-3X-39=0

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

-3X=39

X=39/-3

X=-13

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