x=5(90-x)-30

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Solution for x=5(90-x)-30 equation: 



x=5(90-x)-30

We move all terms to the left:

x-(5(90-x)-30)=0

We add all the numbers together, and all the variables

x-(5(-1x+90)-30)=0



We calculate terms in parentheses: -(5(-1x+90)-30), so:

5(-1x+90)-30

We multiply parentheses

-5x+450-30

We add all the numbers together, and all the variables

-5x+420

Back to the equation:

-(-5x+420)



We get rid of parentheses

x+5x-420=0

We add all the numbers together, and all the variables

6x-420=0

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

6x=420

x=420/6

x=70

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