X=(90-3x)

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



X=(90-3X)

We move all terms to the left:

X-((90-3X))=0

We add all the numbers together, and all the variables

X-((-3X+90))=0



We calculate terms in parentheses: -((-3X+90)), so:

(-3X+90)

We get rid of parentheses

-3X+90

Back to the equation:

-(-3X+90)



We get rid of parentheses

X+3X-90=0

We add all the numbers together, and all the variables

4X-90=0

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

4X=90

X=90/4

X=22+1/2

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