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115+2r+100+(r+25)=360
We simplify the equation to the form, which is simple to understand
115+2r+100+(r+25)=360
Remove unnecessary parentheses
+115+2r+100+r+25=+360
We move all terms containing r to the left and all other terms to the right.
+2r+1r=+360-115-100-25
We simplify left and right side of the equation.
+3r=+120
We divide both sides of the equation by 3 to get r.
r=40
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