90-3x+180-7x-((90-3x)-(180-7x))=180

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Solution for 90-3x+180-7x-((90-3x)-(180-7x))=180 equation: 



90-3x+180-7x-((90-3x)-(180-7x))=180

We move all terms to the left:

90-3x+180-7x-((90-3x)-(180-7x))-(180)=0

We add all the numbers together, and all the variables

-3x-7x-((-3x+90)-(-7x+180))+90+180-180=0

We add all the numbers together, and all the variables

-10x-((-3x+90)-(-7x+180))+90=0



We calculate terms in parentheses: -((-3x+90)-(-7x+180)), so:

(-3x+90)-(-7x+180)

We get rid of parentheses

-3x+7x+90-180

We add all the numbers together, and all the variables

4x-90

Back to the equation:

-(4x-90)



We get rid of parentheses

-10x-4x+90+90=0

We add all the numbers together, and all the variables

-14x+180=0

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

-14x=-180

x=-180/-14

x=12+6/7

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