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10r+100+50=0
We simplify the equation to the form, which is simple to understand
10r+100+50=0
We move all terms containing r to the left and all other terms to the right.
+10r=0-100-50
We simplify left and right side of the equation.
+10r=-150
We divide both sides of the equation by 10 to get r.
r=-15
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