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Simplifying 84 = -2(-5r + -2) Reorder the terms: 84 = -2(-2 + -5r) 84 = (-2 * -2 + -5r * -2) 84 = (4 + 10r) Solving 84 = 4 + 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. 84 + -10r = 4 + 10r + -10r Combine like terms: 10r + -10r = 0 84 + -10r = 4 + 0 84 + -10r = 4 Add '-84' to each side of the equation. 84 + -84 + -10r = 4 + -84 Combine like terms: 84 + -84 = 0 0 + -10r = 4 + -84 -10r = 4 + -84 Combine like terms: 4 + -84 = -80 -10r = -80 Divide each side by '-10'. r = 8 Simplifying r = 8
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