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Simplifying 21x + -18 = 7(3x + 6) + -5 Reorder the terms: -18 + 21x = 7(3x + 6) + -5 Reorder the terms: -18 + 21x = 7(6 + 3x) + -5 -18 + 21x = (6 * 7 + 3x * 7) + -5 -18 + 21x = (42 + 21x) + -5 Reorder the terms: -18 + 21x = 42 + -5 + 21x Combine like terms: 42 + -5 = 37 -18 + 21x = 37 + 21x Add '-21x' to each side of the equation. -18 + 21x + -21x = 37 + 21x + -21x Combine like terms: 21x + -21x = 0 -18 + 0 = 37 + 21x + -21x -18 = 37 + 21x + -21x Combine like terms: 21x + -21x = 0 -18 = 37 + 0 -18 = 37 Solving -18 = 37 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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