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Simplifying 7r + -2(3 + -7r) = -76 + 21r 7r + (3 * -2 + -7r * -2) = -76 + 21r 7r + (-6 + 14r) = -76 + 21r Reorder the terms: -6 + 7r + 14r = -76 + 21r Combine like terms: 7r + 14r = 21r -6 + 21r = -76 + 21r Add '-21r' to each side of the equation. -6 + 21r + -21r = -76 + 21r + -21r Combine like terms: 21r + -21r = 0 -6 + 0 = -76 + 21r + -21r -6 = -76 + 21r + -21r Combine like terms: 21r + -21r = 0 -6 = -76 + 0 -6 = -76 Solving -6 = -76 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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