-10(2+r)=20

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Solution for -10(2+r)=20 equation: 



-10(2+r)=20

We move all terms to the left:

-10(2+r)-(20)=0

We add all the numbers together, and all the variables

-10(r+2)-20=0

We multiply parentheses

-10r-20-20=0

We add all the numbers together, and all the variables

-10r-40=0

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

-10r=40

r=40/-10

r=-4

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