3x=(90-x)-15

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Solution for 3x=(90-x)-15 equation: 



3x=(90-x)-15

We move all terms to the left:

3x-((90-x)-15)=0

We add all the numbers together, and all the variables

3x-((-1x+90)-15)=0



We calculate terms in parentheses: -((-1x+90)-15), so:

(-1x+90)-15

We get rid of parentheses

-1x+90-15

We add all the numbers together, and all the variables

-1x+75

Back to the equation:

-(-1x+75)



We get rid of parentheses

3x+1x-75=0

We add all the numbers together, and all the variables

4x-75=0

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

4x=75

x=75/4

x=18+3/4

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