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12=-r-10+3r
We simplify the equation to the form, which is simple to understand
12=-r-10+3r
We move all terms containing r to the left and all other terms to the right.
+1r-3r=-10-12
We simplify left and right side of the equation.
-2r=-22
We divide both sides of the equation by -2 to get r.
r=11
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