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1203+40+r=800
We simplify the equation to the form, which is simple to understand
1203+40+r=800
We move all terms containing r to the left and all other terms to the right.
+1r=+800-1203-40
We simplify left and right side of the equation.
+1r=-443
We divide both sides of the equation by 1 to get r.
r=-443
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