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.50-r=-.75
We simplify the equation to the form, which is simple to understand
.50-r=-.75
We move all terms containing r to the left and all other terms to the right.
-1r=-0.75-0.5
We simplify left and right side of the equation.
-1r=-1.25
We divide both sides of the equation by -1 to get r.
r=1.25
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