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-(-7+r)=22
We simplify the equation to the form, which is simple to understand
-(-7+r)=22
Remove unnecessary parentheses
+7-1r=22
We move all terms containing r to the left and all other terms to the right.
-1r=+22-7
We simplify left and right side of the equation.
-1r=+15
We divide both sides of the equation by -1 to get r.
r=-15
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