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4+(r+2)=7
We simplify the equation to the form, which is simple to understand
4+(r+2)=7
Remove unnecessary parentheses
+4+r+2=+7
We move all terms containing r to the left and all other terms to the right.
+1r=+7-4-2
We simplify left and right side of the equation.
+1r=+1
We divide both sides of the equation by 1 to get r.
r=1
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