(40+r)+9=40+(2+9)

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Solution for (40+r)+9=40+(2+9) equation: 



(40+r)+9=40+(2+9)

We move all terms to the left:

(40+r)+9-(40+(2+9))=0

We add all the numbers together, and all the variables

(r+40)+9-(40+11)=0

We add all the numbers together, and all the variables

(r+40)-42=0

We get rid of parentheses

r+40-42=0

We add all the numbers together, and all the variables

r-2=0

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

r=2

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