(X+7)+y=30

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Solution for (X+7)+y=30 equation: 



(X+7)+X=30

We move all terms to the left:

(X+7)+X-(30)=0

We add all the numbers together, and all the variables

X+(X+7)-30=0

We get rid of parentheses

X+X+7-30=0

We add all the numbers together, and all the variables

2X-23=0

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

2X=23

X=23/2

X=11+1/2

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