X=2(90-x)-30

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Solution for X=2(90-x)-30 equation: 



X=2(90-X)-30

We move all terms to the left:

X-(2(90-X)-30)=0

We add all the numbers together, and all the variables

X-(2(-1X+90)-30)=0



We calculate terms in parentheses: -(2(-1X+90)-30), so:

2(-1X+90)-30

We multiply parentheses

-2X+180-30

We add all the numbers together, and all the variables

-2X+150

Back to the equation:

-(-2X+150)



We get rid of parentheses

X+2X-150=0

We add all the numbers together, and all the variables

3X-150=0

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

3X=150

X=150/3

X=50

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