(90-x)+2x+x=18

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Solution for (90-x)+2x+x=18 equation: 



(90-x)+2x+x=18

We move all terms to the left:

(90-x)+2x+x-(18)=0

We add all the numbers together, and all the variables

(-1x+90)+2x+x-18=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

3x-1x+90-18=0

We add all the numbers together, and all the variables

2x+72=0

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

2x=-72

x=-72/2

x=-36

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