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r-(-3)=3
We simplify the equation to the form, which is simple to understand
r-(-3)=3
Remove unnecessary parentheses
r+3=3
We move all terms containing r to the left and all other terms to the right.
+1r=+3-3
We simplify left and right side of the equation.
+1r=0
We divide both sides of the equation by 1 to get r.
r=0
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