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Simplifying -3(1 + 6) * r = 14 + -1r Combine like terms: 1 + 6 = 7 -3(7) * r = 14 + -1r Multiply -3 * 7 -21r = 14 + -1r Solving -21r = 14 + -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. -21r + r = 14 + -1r + r Combine like terms: -21r + r = -20r -20r = 14 + -1r + r Combine like terms: -1r + r = 0 -20r = 14 + 0 -20r = 14 Divide each side by '-20'. r = -0.7 Simplifying r = -0.7
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