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168=-8(r-4)
We simplify the equation to the form, which is simple to understand
168=-8(r-4)
Reorder the terms in parentheses
168=+(-8r+32)
Remove unnecessary parentheses
+168=-8r+32
We move all terms containing r to the left and all other terms to the right.
+8r=+32-168
We simplify left and right side of the equation.
+8r=-136
We divide both sides of the equation by 08 to get r.
r=-17
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