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Simplifying 7(x + -4) + 7 = 3x + 4(-4 + x) Reorder the terms: 7(-4 + x) + 7 = 3x + 4(-4 + x) (-4 * 7 + x * 7) + 7 = 3x + 4(-4 + x) (-28 + 7x) + 7 = 3x + 4(-4 + x) Reorder the terms: -28 + 7 + 7x = 3x + 4(-4 + x) Combine like terms: -28 + 7 = -21 -21 + 7x = 3x + 4(-4 + x) -21 + 7x = 3x + (-4 * 4 + x * 4) -21 + 7x = 3x + (-16 + 4x) Reorder the terms: -21 + 7x = -16 + 3x + 4x Combine like terms: 3x + 4x = 7x -21 + 7x = -16 + 7x Add '-7x' to each side of the equation. -21 + 7x + -7x = -16 + 7x + -7x Combine like terms: 7x + -7x = 0 -21 + 0 = -16 + 7x + -7x -21 = -16 + 7x + -7x Combine like terms: 7x + -7x = 0 -21 = -16 + 0 -21 = -16 Solving -21 = -16 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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