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8-4=10+2r
We simplify the equation to the form, which is simple to understand
8-4=10+2r
We move all terms containing r to the left and all other terms to the right.
-2r=+10-8+4
We simplify left and right side of the equation.
-2r=+6
We divide both sides of the equation by -02 to get r.
r=-3
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