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-37-3r=-1+8(1+r)
We simplify the equation to the form, which is simple to understand
-37-3r=-1+8(1+r)
Reorder the terms in parentheses
-37-3r=-1+(+8+8r)
Remove unnecessary parentheses
-37-3r=-1+8+8r
We move all terms containing r to the left and all other terms to the right.
-3r-8r=-1+8+37
We simplify left and right side of the equation.
-11r=+44
We divide both sides of the equation by -11 to get r.
r=-4
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