7(90-x)=180-x

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



7(90-x)=180-x

We move all terms to the left:

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

We add all the numbers together, and all the variables

7(-1x+90)-(-1x+180)=0

We multiply parentheses

-7x-(-1x+180)+630=0

We get rid of parentheses

-7x+1x-180+630=0

We add all the numbers together, and all the variables

-6x+450=0

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

-6x=-450

x=-450/-6

x=+75

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