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15=4r+1+3r
We simplify the equation to the form, which is simple to understand
15=4r+1+3r
We move all terms containing r to the left and all other terms to the right.
-4r-3r=+1-15
We simplify left and right side of the equation.
-7r=-14
We divide both sides of the equation by -7 to get r.
r=2
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