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