X-12=5(21-x)

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Solution for X-12=5(21-x) equation: 



X-12=5(21-X)

We move all terms to the left:

X-12-(5(21-X))=0

We add all the numbers together, and all the variables

X-(5(-1X+21))-12=0



We calculate terms in parentheses: -(5(-1X+21)), so:

5(-1X+21)

We multiply parentheses

-5X+105

Back to the equation:

-(-5X+105)



We get rid of parentheses

X+5X-105-12=0

We add all the numbers together, and all the variables

6X-117=0

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

6X=117

X=117/6

X=19+1/2

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