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-10r+1.5+2r+1.5=64
We simplify the equation to the form, which is simple to understand
-10r+1.5+2r+1.5=64
We move all terms containing r to the left and all other terms to the right.
-10r+2r=+64-1.5-1.5
We simplify left and right side of the equation.
-8r=+61
We divide both sides of the equation by -8 to get r.
r=-7.625
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