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-5r+10+3=0
We simplify the equation to the form, which is simple to understand
-5r+10+3=0
We move all terms containing r to the left and all other terms to the right.
-5r=0-10-3
We simplify left and right side of the equation.
-5r=-13
We divide both sides of the equation by -5 to get r.
r=2.6
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