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Simplifying 7x + -1(3x + 1) = 4(3 + x) Reorder the terms: 7x + -1(1 + 3x) = 4(3 + x) 7x + (1 * -1 + 3x * -1) = 4(3 + x) 7x + (-1 + -3x) = 4(3 + x) Reorder the terms: -1 + 7x + -3x = 4(3 + x) Combine like terms: 7x + -3x = 4x -1 + 4x = 4(3 + x) -1 + 4x = (3 * 4 + x * 4) -1 + 4x = (12 + 4x) Add '-4x' to each side of the equation. -1 + 4x + -4x = 12 + 4x + -4x Combine like terms: 4x + -4x = 0 -1 + 0 = 12 + 4x + -4x -1 = 12 + 4x + -4x Combine like terms: 4x + -4x = 0 -1 = 12 + 0 -1 = 12 Solving -1 = 12 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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