120-x=20+3(90-x)

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Solution for 120-x=20+3(90-x) equation: 



120-x=20+3(90-x)

We move all terms to the left:

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

We add all the numbers together, and all the variables

-x-(20+3(-1x+90))+120=0

We add all the numbers together, and all the variables

-1x-(20+3(-1x+90))+120=0



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

20+3(-1x+90)

determiningTheFunctionDomain
3(-1x+90)+20

We multiply parentheses

-3x+270+20

We add all the numbers together, and all the variables

-3x+290

Back to the equation:

-(-3x+290)



We get rid of parentheses

-1x+3x-290+120=0

We add all the numbers together, and all the variables

2x-170=0

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

2x=170

x=170/2

x=85

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