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Simplifying 3x + -7(4 + x) = -4(x + 9) 3x + (4 * -7 + x * -7) = -4(x + 9) 3x + (-28 + -7x) = -4(x + 9) Reorder the terms: -28 + 3x + -7x = -4(x + 9) Combine like terms: 3x + -7x = -4x -28 + -4x = -4(x + 9) Reorder the terms: -28 + -4x = -4(9 + x) -28 + -4x = (9 * -4 + x * -4) -28 + -4x = (-36 + -4x) Add '4x' to each side of the equation. -28 + -4x + 4x = -36 + -4x + 4x Combine like terms: -4x + 4x = 0 -28 + 0 = -36 + -4x + 4x -28 = -36 + -4x + 4x Combine like terms: -4x + 4x = 0 -28 = -36 + 0 -28 = -36 Solving -28 = -36 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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