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Simplifying (a + 3) * 0 = r Reorder the terms: (3 + a) * 0 = r Reorder the terms for easier multiplication: 0(3 + a) = r Anything times zero is zero. 0(3 + a) = r Solving 0 = r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 0 + -1r = r + -1r Remove the zero: -1r = r + -1r Combine like terms: r + -1r = 0 -1r = 0 Divide each side by '-1'. r = 0 Simplifying r = 0
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