x=(90-x)-78

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Solution for x=(90-x)-78 equation: 



x=(90-x)-78

We move all terms to the left:

x-((90-x)-78)=0

We add all the numbers together, and all the variables

x-((-1x+90)-78)=0



We calculate terms in parentheses: -((-1x+90)-78), so:

(-1x+90)-78

We get rid of parentheses

-1x+90-78

We add all the numbers together, and all the variables

-1x+12

Back to the equation:

-(-1x+12)



We get rid of parentheses

x+1x-12=0

We add all the numbers together, and all the variables

2x-12=0

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

2x=12

x=12/2

x=6

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