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-30=-5(8+r)-2(r+2)
We simplify the equation to the form, which is simple to understand
-30=-5(8+r)-2(r+2)
Reorder the terms in parentheses
-30=+(-40-5r)-2*(r+2)
Remove unnecessary parentheses
-30=-40-5r-2+*(+r+2+)
Reorder the terms in parentheses
-30=-40-5r+(-2r-4)
Remove unnecessary parentheses
-30=-40-5r-2r-4
We move all terms containing r to the left and all other terms to the right.
+5r+2r=-40-4+30
We simplify left and right side of the equation.
+7r=-14
We divide both sides of the equation by 7 to get r.
r=-2
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