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-9=-8+4r-5
We simplify the equation to the form, which is simple to understand
-9=-8+4r-5
We move all terms containing r to the left and all other terms to the right.
-4r=-8-5+9
We simplify left and right side of the equation.
-4r=-4
We divide both sides of the equation by -04 to get r.
r=1
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