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Simplifying (r + -5) + -7.9 = 2.1 Reorder the terms: (-5 + r) + -7.9 = 2.1 Remove parenthesis around (-5 + r) -5 + r + -7.9 = 2.1 Reorder the terms: -5 + -7.9 + r = 2.1 Combine like terms: -5 + -7.9 = -12.9 -12.9 + r = 2.1 Solving -12.9 + r = 2.1 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12.9' to each side of the equation. -12.9 + 12.9 + r = 2.1 + 12.9 Combine like terms: -12.9 + 12.9 = 0.0 0.0 + r = 2.1 + 12.9 r = 2.1 + 12.9 Combine like terms: 2.1 + 12.9 = 15 r = 15 Simplifying r = 15
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