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Simplifying -1r + 2(7r + -3) = -84 Reorder the terms: -1r + 2(-3 + 7r) = -84 -1r + (-3 * 2 + 7r * 2) = -84 -1r + (-6 + 14r) = -84 Reorder the terms: -6 + -1r + 14r = -84 Combine like terms: -1r + 14r = 13r -6 + 13r = -84 Solving -6 + 13r = -84 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + 13r = -84 + 6 Combine like terms: -6 + 6 = 0 0 + 13r = -84 + 6 13r = -84 + 6 Combine like terms: -84 + 6 = -78 13r = -78 Divide each side by '13'. r = -6 Simplifying r = -6
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