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7+r=4(r+4)
We simplify the equation to the form, which is simple to understand
7+r=4(r+4)
Reorder the terms in parentheses
7+r=+(+4r+16)
Remove unnecessary parentheses
+7+r=+4r+16
We move all terms containing r to the left and all other terms to the right.
+1r-4r=+16-7
We simplify left and right side of the equation.
-3r=+9
We divide both sides of the equation by -3 to get r.
r=-3
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