x=3(90-x)-10

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Solution for x=3(90-x)-10 equation: 



x=3(90-x)-10

We move all terms to the left:

x-(3(90-x)-10)=0

We add all the numbers together, and all the variables

x-(3(-1x+90)-10)=0



We calculate terms in parentheses: -(3(-1x+90)-10), so:

3(-1x+90)-10

We multiply parentheses

-3x+270-10

We add all the numbers together, and all the variables

-3x+260

Back to the equation:

-(-3x+260)



We get rid of parentheses

x+3x-260=0

We add all the numbers together, and all the variables

4x-260=0

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

4x=260

x=260/4

x=65

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