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4r=4-4r
We simplify the equation to the form, which is simple to understand
4r=4-4r
We move all terms containing r to the left and all other terms to the right.
+4r+4r=+4
We simplify left and right side of the equation.
+8r=+4
We divide both sides of the equation by 8 to get r.
r=0.5
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