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Simplifying -10 = 5(2r + -4) Reorder the terms: -10 = 5(-4 + 2r) -10 = (-4 * 5 + 2r * 5) -10 = (-20 + 10r) Solving -10 = -20 + 10r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-10r' to each side of the equation. -10 + -10r = -20 + 10r + -10r Combine like terms: 10r + -10r = 0 -10 + -10r = -20 + 0 -10 + -10r = -20 Add '10' to each side of the equation. -10 + 10 + -10r = -20 + 10 Combine like terms: -10 + 10 = 0 0 + -10r = -20 + 10 -10r = -20 + 10 Combine like terms: -20 + 10 = -10 -10r = -10 Divide each side by '-10'. r = 1 Simplifying r = 1
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