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5r+2r=50-r
We simplify the equation to the form, which is simple to understand
5r+2r=50-r
We move all terms containing r to the left and all other terms to the right.
+5r+2r+1r=+50
We simplify left and right side of the equation.
+8r=+50
We divide both sides of the equation by 8 to get r.
r=6.25
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