-21+2r=7r+3(r+1)

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Solution for -21+2r=7r+3(r+1) equation:


-21+2r=7r+3(r+1)

We simplify the equation to the form, which is simple to understand 
-21+2r=7r+3(r+1)

Reorder the terms in parentheses
-21+2r=7r+(+3r+3)

Remove unnecessary parentheses
-21+2r=+7r+3r+3

We move all terms containing r to the left and all other terms to the right. 
+2r-7r-3r=+3+21

We simplify left and right side of the equation. 
-8r=+24

We divide both sides of the equation by -8 to get r. 
r=-3

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