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4r*400=1100
We simplify the equation to the form, which is simple to understand
4r*400=1100
Simplifying:
+1600r=1100
We move all terms containing r to the left and all other terms to the right.
+1600r=+1100
We simplify left and right side of the equation.
+1600r=+1100
We divide both sides of the equation by 1600 to get r.
r=0.6875
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