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r-65=3r-21
We simplify the equation to the form, which is simple to understand
r-65=3r-21
We move all terms containing r to the left and all other terms to the right.
+1r-3r=-21+65
We simplify left and right side of the equation.
-2r=+44
We divide both sides of the equation by -2 to get r.
r=-22
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