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Simplifying 7(3x + -3) + -3 = 21x + -21 Reorder the terms: 7(-3 + 3x) + -3 = 21x + -21 (-3 * 7 + 3x * 7) + -3 = 21x + -21 (-21 + 21x) + -3 = 21x + -21 Reorder the terms: -21 + -3 + 21x = 21x + -21 Combine like terms: -21 + -3 = -24 -24 + 21x = 21x + -21 Reorder the terms: -24 + 21x = -21 + 21x Add '-21x' to each side of the equation. -24 + 21x + -21x = -21 + 21x + -21x Combine like terms: 21x + -21x = 0 -24 + 0 = -21 + 21x + -21x -24 = -21 + 21x + -21x Combine like terms: 21x + -21x = 0 -24 = -21 + 0 -24 = -21 Solving -24 = -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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