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-(-9r+7)=8-(8-10r)
We simplify the equation to the form, which is simple to understand
-(-9r+7)=8-(8-10r)
Remove unnecessary parentheses
+9r-7=8-(8-10r)
Remove unnecessary parentheses
+9r-7=8-8+10r
We move all terms containing r to the left and all other terms to the right.
+9r-10r=+8-8+7
We simplify left and right side of the equation.
-1r=+7
We divide both sides of the equation by -1 to get r.
r=-7
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