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