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Simplifying -3.5(2 + 2r) + -7 = -28 (2 * -3.5 + 2r * -3.5) + -7 = -28 (-7 + -7r) + -7 = -28 Reorder the terms: -7 + -7 + -7r = -28 Combine like terms: -7 + -7 = -14 -14 + -7r = -28 Solving -14 + -7r = -28 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + -7r = -28 + 14 Combine like terms: -14 + 14 = 0 0 + -7r = -28 + 14 -7r = -28 + 14 Combine like terms: -28 + 14 = -14 -7r = -14 Divide each side by '-7'. r = 2 Simplifying r = 2
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