X=3(20-x)

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Solution for X=3(20-x) equation: 



X=3(20-X)

We move all terms to the left:

X-(3(20-X))=0

We add all the numbers together, and all the variables

X-(3(-1X+20))=0



We calculate terms in parentheses: -(3(-1X+20)), so:

3(-1X+20)

We multiply parentheses

-3X+60

Back to the equation:

-(-3X+60)



We get rid of parentheses

X+3X-60=0

We add all the numbers together, and all the variables

4X-60=0

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

4X=60

X=60/4

X=15

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