-8=-7(1+3r)-(1+8r)

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Solution for -8=-7(1+3r)-(1+8r) equation:


-8=-7(1+3r)-(1+8r)

We simplify the equation to the form, which is simple to understand 
-8=-7(1+3r)-(1+8r)

Reorder the terms in parentheses
-8=+(-7-21r)-(1+8r)

Remove unnecessary parentheses
-8=-7-21r-(+1+8r+)

Remove unnecessary parentheses
-8=-7-21r-1-8r

We move all terms containing r to the left and all other terms to the right. 
+21r+8r=-7-1+8

We simplify left and right side of the equation. 
+29r=0

We divide both sides of the equation by 29 to get r. 
r=0

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