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Simplifying 3(x + -4) + -4 = -3x + 6x + -21 Reorder the terms: 3(-4 + x) + -4 = -3x + 6x + -21 (-4 * 3 + x * 3) + -4 = -3x + 6x + -21 (-12 + 3x) + -4 = -3x + 6x + -21 Reorder the terms: -12 + -4 + 3x = -3x + 6x + -21 Combine like terms: -12 + -4 = -16 -16 + 3x = -3x + 6x + -21 Reorder the terms: -16 + 3x = -21 + -3x + 6x Combine like terms: -3x + 6x = 3x -16 + 3x = -21 + 3x Add '-3x' to each side of the equation. -16 + 3x + -3x = -21 + 3x + -3x Combine like terms: 3x + -3x = 0 -16 + 0 = -21 + 3x + -3x -16 = -21 + 3x + -3x Combine like terms: 3x + -3x = 0 -16 = -21 + 0 -16 = -21 Solving -16 = -21 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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