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Simplifying 2(r + -12) + -15 = -5 Reorder the terms: 2(-12 + r) + -15 = -5 (-12 * 2 + r * 2) + -15 = -5 (-24 + 2r) + -15 = -5 Reorder the terms: -24 + -15 + 2r = -5 Combine like terms: -24 + -15 = -39 -39 + 2r = -5 Solving -39 + 2r = -5 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '39' to each side of the equation. -39 + 39 + 2r = -5 + 39 Combine like terms: -39 + 39 = 0 0 + 2r = -5 + 39 2r = -5 + 39 Combine like terms: -5 + 39 = 34 2r = 34 Divide each side by '2'. r = 17 Simplifying r = 17
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