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8-4r=-2r+(-10)
We simplify the equation to the form, which is simple to understand
8-4r=-2r+(-10)
Remove unnecessary parentheses
+8-4r=-2r-10
We move all terms containing r to the left and all other terms to the right.
-4r+2r=-10-8
We simplify left and right side of the equation.
-2r=-18
We divide both sides of the equation by -2 to get r.
r=9
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