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5r-2r=30
We simplify the equation to the form, which is simple to understand
5r-2r=30
We move all terms containing r to the left and all other terms to the right.
+5r-2r=+30
We simplify left and right side of the equation.
+3r=+30
We divide both sides of the equation by 3 to get r.
r=10
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