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1r-7r-30=0
We simplify the equation to the form, which is simple to understand
1r-7r-30=0
We move all terms containing r to the left and all other terms to the right.
+1r-7r=0+30
We simplify left and right side of the equation.
-6r=+30
We divide both sides of the equation by -6 to get r.
r=-5
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