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r+4=4r+16
We simplify the equation to the form, which is simple to understand
r+4=4r+16
We move all terms containing r to the left and all other terms to the right.
+1r-4r=+16-4
We simplify left and right side of the equation.
-3r=+12
We divide both sides of the equation by -3 to get r.
r=-4
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