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Simplifying 3(7r + -12) = 21r + -6 Reorder the terms: 3(-12 + 7r) = 21r + -6 (-12 * 3 + 7r * 3) = 21r + -6 (-36 + 21r) = 21r + -6 Reorder the terms: -36 + 21r = -6 + 21r Add '-21r' to each side of the equation. -36 + 21r + -21r = -6 + 21r + -21r Combine like terms: 21r + -21r = 0 -36 + 0 = -6 + 21r + -21r -36 = -6 + 21r + -21r Combine like terms: 21r + -21r = 0 -36 = -6 + 0 -36 = -6 Solving -36 = -6 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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