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-9=r/4
We simplify the equation to the form, which is simple to understand
-9=r/4
Simplifying:
-9=0.25r
We move all terms containing r to the left and all other terms to the right.
-0.25r=+9
We simplify left and right side of the equation.
-0.25r=+9
We divide both sides of the equation by -00.25 to get r.
r=-36
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