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-17r+10r-20=-9r+18
We simplify the equation to the form, which is simple to understand
-17r+10r-20=-9r+18
We move all terms containing r to the left and all other terms to the right.
-17r+10r+9r=+18+20
We simplify left and right side of the equation.
+2r=+38
We divide both sides of the equation by 2 to get r.
r=19
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