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Simplifying 3(x + -7) + x = 4x + -9 + 2 Reorder the terms: 3(-7 + x) + x = 4x + -9 + 2 (-7 * 3 + x * 3) + x = 4x + -9 + 2 (-21 + 3x) + x = 4x + -9 + 2 Combine like terms: 3x + x = 4x -21 + 4x = 4x + -9 + 2 Reorder the terms: -21 + 4x = -9 + 2 + 4x Combine like terms: -9 + 2 = -7 -21 + 4x = -7 + 4x Add '-4x' to each side of the equation. -21 + 4x + -4x = -7 + 4x + -4x Combine like terms: 4x + -4x = 0 -21 + 0 = -7 + 4x + -4x -21 = -7 + 4x + -4x Combine like terms: 4x + -4x = 0 -21 = -7 + 0 -21 = -7 Solving -21 = -7 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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