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12=1.25*(1+220/r)
We simplify the equation to the form, which is simple to understand
12=1.25*(1+220/r)
Reorder the terms in parentheses
12=+(+1.25/r)
Remove unnecessary parentheses
+12=+1.25+/r
We move all terms containing r to the left and all other terms to the right.
-1r=+1.25-12
We simplify left and right side of the equation.
-1r=-10.75
We divide both sides of the equation by -01 to get r.
r=10.75
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