(25-x)+(15+x)+(18+x)+x=20

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Solution for (25-x)+(15+x)+(18+x)+x=20 equation: 



(25-x)+(15+x)+(18+x)+x=20

We move all terms to the left:

(25-x)+(15+x)+(18+x)+x-(20)=0

We add all the numbers together, and all the variables

(-1x+25)+(x+15)+(x+18)+x-20=0

We add all the numbers together, and all the variables

x+(-1x+25)+(x+15)+(x+18)-20=0

We get rid of parentheses

x-1x+x+x+25+15+18-20=0

We add all the numbers together, and all the variables

2x+38=0

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

2x=-38

x=-38/2

x=-19

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