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Simplifying 21 = 6(5r + -2) Reorder the terms: 21 = 6(-2 + 5r) 21 = (-2 * 6 + 5r * 6) 21 = (-12 + 30r) Solving 21 = -12 + 30r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-30r' to each side of the equation. 21 + -30r = -12 + 30r + -30r Combine like terms: 30r + -30r = 0 21 + -30r = -12 + 0 21 + -30r = -12 Add '-21' to each side of the equation. 21 + -21 + -30r = -12 + -21 Combine like terms: 21 + -21 = 0 0 + -30r = -12 + -21 -30r = -12 + -21 Combine like terms: -12 + -21 = -33 -30r = -33 Divide each side by '-30'. r = 1.1 Simplifying r = 1.1
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