(27-x)+x+(28-x)+15=100

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Solution for (27-x)+x+(28-x)+15=100 equation: 



(27-x)+x+(28-x)+15=100

We move all terms to the left:

(27-x)+x+(28-x)+15-(100)=0

We add all the numbers together, and all the variables

(-1x+27)+x+(-1x+28)+15-100=0

We add all the numbers together, and all the variables

x+(-1x+27)+(-1x+28)-85=0

We get rid of parentheses

x-1x-1x+27+28-85=0

We add all the numbers together, and all the variables

-1x-30=0

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

-x=30

x=30/-1

x=-30

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