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-13=8+7+14r
We simplify the equation to the form, which is simple to understand
-13=8+7+14r
We move all terms containing r to the left and all other terms to the right.
-14r=+8+7+13
We simplify left and right side of the equation.
-14r=+28
We divide both sides of the equation by -014 to get r.
r=-2
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