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Simplifying -3 = -3(2r + -4) Reorder the terms: -3 = -3(-4 + 2r) -3 = (-4 * -3 + 2r * -3) -3 = (12 + -6r) Solving -3 = 12 + -6r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '6r' to each side of the equation. -3 + 6r = 12 + -6r + 6r Combine like terms: -6r + 6r = 0 -3 + 6r = 12 + 0 -3 + 6r = 12 Add '3' to each side of the equation. -3 + 3 + 6r = 12 + 3 Combine like terms: -3 + 3 = 0 0 + 6r = 12 + 3 6r = 12 + 3 Combine like terms: 12 + 3 = 15 6r = 15 Divide each side by '6'. r = 2.5 Simplifying r = 2.5
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