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-r+2-5r+3+4r=0
We simplify the equation to the form, which is simple to understand
-r+2-5r+3+4r=0
We move all terms containing r to the left and all other terms to the right.
-1r-5r+4r=0-2-3
We simplify left and right side of the equation.
-2r=-5
We divide both sides of the equation by -2 to get r.
r=2.5
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