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.9r+.5=.77
We simplify the equation to the form, which is simple to understand
.9r+.5=.77
We move all terms containing r to the left and all other terms to the right.
+ 0.9r=0.77-0.5
We simplify left and right side of the equation.
+ 0.9r=0.27
We divide both sides of the equation by 0.9 to get r.
r=0.3
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