x=3(90-x)-20

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Solution for x=3(90-x)-20 equation: 



x=3(90-x)-20

We move all terms to the left:

x-(3(90-x)-20)=0

We add all the numbers together, and all the variables

x-(3(-1x+90)-20)=0



We calculate terms in parentheses: -(3(-1x+90)-20), so:

3(-1x+90)-20

We multiply parentheses

-3x+270-20

We add all the numbers together, and all the variables

-3x+250

Back to the equation:

-(-3x+250)



We get rid of parentheses

x+3x-250=0

We add all the numbers together, and all the variables

4x-250=0

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

4x=250

x=250/4

x=62+1/2

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