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r-11/3+2r=-72/6
We simplify the equation to the form, which is simple to understand
r-11/3+2r=-72/6
We move all terms containing r to the left and all other terms to the right.
+1r+2r=-12+3.6666666666667
We simplify left and right side of the equation.
+3r=-8.3333333333333
We divide both sides of the equation by 3 to get r.
r=-2.7777777777778
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