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-144=-8(2r+4)
We simplify the equation to the form, which is simple to understand
-144=-8(2r+4)
Reorder the terms in parentheses
-144=+(-16r-32)
Remove unnecessary parentheses
-144=-16r-32
We move all terms containing r to the left and all other terms to the right.
+16r=-32+144
We simplify left and right side of the equation.
+16r=+112
We divide both sides of the equation by 016 to get r.
r=7
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