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Simplifying 3r + -3 + -3 = -21 Reorder the terms: -3 + -3 + 3r = -21 Combine like terms: -3 + -3 = -6 -6 + 3r = -21 Solving -6 + 3r = -21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + 3r = -21 + 6 Combine like terms: -6 + 6 = 0 0 + 3r = -21 + 6 3r = -21 + 6 Combine like terms: -21 + 6 = -15 3r = -15 Divide each side by '3'. r = -5 Simplifying r = -5
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