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4r+5r=25+11
We simplify the equation to the form, which is simple to understand
4r+5r=25+11
We move all terms containing r to the left and all other terms to the right.
+4r+5r=+25+11
We simplify left and right side of the equation.
+9r=+36
We divide both sides of the equation by 9 to get r.
r=4
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