x+(x-15)+(x-20)=7

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Solution for x+(x-15)+(x-20)=7 equation: 



x+(x-15)+(x-20)=7

We move all terms to the left:

x+(x-15)+(x-20)-(7)=0

We get rid of parentheses

x+x+x-15-20-7=0

We add all the numbers together, and all the variables

3x-42=0

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

3x=42

x=42/3

x=14

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