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Simplifying 3x + -7(1 + x) = -4(x + 7) 3x + (1 * -7 + x * -7) = -4(x + 7) 3x + (-7 + -7x) = -4(x + 7) Reorder the terms: -7 + 3x + -7x = -4(x + 7) Combine like terms: 3x + -7x = -4x -7 + -4x = -4(x + 7) Reorder the terms: -7 + -4x = -4(7 + x) -7 + -4x = (7 * -4 + x * -4) -7 + -4x = (-28 + -4x) Add '4x' to each side of the equation. -7 + -4x + 4x = -28 + -4x + 4x Combine like terms: -4x + 4x = 0 -7 + 0 = -28 + -4x + 4x -7 = -28 + -4x + 4x Combine like terms: -4x + 4x = 0 -7 = -28 + 0 -7 = -28 Solving -7 = -28 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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