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9+.5r=12
We simplify the equation to the form, which is simple to understand
9+.5r=12
We move all terms containing r to the left and all other terms to the right.
+ 0.5r=+12-9
We simplify left and right side of the equation.
+ 0.5r=+3
We divide both sides of the equation by 0.5 to get r.
r=6
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