(x+Y)+(x-Y)=15+3

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Solution for (x+Y)+(x-Y)=15+3 equation: 



(x+)+(x-)=15+3

We move all terms to the left:

(x+)+(x-)-(15+3)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

x+x-18=0

We add all the numbers together, and all the variables

2x-18=0

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

2x=18

x=18/2

x=9

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