3(90-x)-18=x

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Solution for 3(90-x)-18=x equation: 



3(90-x)-18=x

We move all terms to the left:

3(90-x)-18-(x)=0

We add all the numbers together, and all the variables

3(-1x+90)-x-18=0

We add all the numbers together, and all the variables

-1x+3(-1x+90)-18=0

We multiply parentheses

-1x-3x+270-18=0

We add all the numbers together, and all the variables

-4x+252=0

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

-4x=-252

x=-252/-4

x=+63

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