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15r=-20r+7(3r-4)
We simplify the equation to the form, which is simple to understand
15r=-20r+7(3r-4)
Reorder the terms in parentheses
15r=-20r+(+21r-28)
Remove unnecessary parentheses
+15r=-20r+21r-28
We move all terms containing r to the left and all other terms to the right.
+15r+20r-21r=-28
We simplify left and right side of the equation.
+14r=-28
We divide both sides of the equation by 14 to get r.
r=-2
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