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Simplifying (r + -4) + -9 = 3 Reorder the terms: (-4 + r) + -9 = 3 Remove parenthesis around (-4 + r) -4 + r + -9 = 3 Reorder the terms: -4 + -9 + r = 3 Combine like terms: -4 + -9 = -13 -13 + r = 3 Solving -13 + r = 3 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + r = 3 + 13 Combine like terms: -13 + 13 = 0 0 + r = 3 + 13 r = 3 + 13 Combine like terms: 3 + 13 = 16 r = 16 Simplifying r = 16
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