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-4+4=8+r
We simplify the equation to the form, which is simple to understand
-4+4=8+r
We move all terms containing r to the left and all other terms to the right.
-1r=+8+4-4
We simplify left and right side of the equation.
-1r=+8
We divide both sides of the equation by -01 to get r.
r=-8
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