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Simplifying -28 + 2r = 4(-5r + -7) Reorder the terms: -28 + 2r = 4(-7 + -5r) -28 + 2r = (-7 * 4 + -5r * 4) -28 + 2r = (-28 + -20r) Add '28' to each side of the equation. -28 + 28 + 2r = -28 + 28 + -20r Combine like terms: -28 + 28 = 0 0 + 2r = -28 + 28 + -20r 2r = -28 + 28 + -20r Combine like terms: -28 + 28 = 0 2r = 0 + -20r 2r = -20r Solving 2r = -20r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '20r' to each side of the equation. 2r + 20r = -20r + 20r Combine like terms: 2r + 20r = 22r 22r = -20r + 20r Combine like terms: -20r + 20r = 0 22r = 0 Divide each side by '22'. r = 0 Simplifying r = 0
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