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

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


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

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

Remove unnecessary parentheses
+r+2r+(+r-3+)=+21

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

We move all terms containing r to the left and all other terms to the right. 
+1r+2r+1r=+21+3

We simplify left and right side of the equation. 
+4r=+24

We divide both sides of the equation by 4 to get r. 
r=6

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