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Simplifying 7(1 + 3x) + -4 = -3(7 + -7x) (1 * 7 + 3x * 7) + -4 = -3(7 + -7x) (7 + 21x) + -4 = -3(7 + -7x) Reorder the terms: 7 + -4 + 21x = -3(7 + -7x) Combine like terms: 7 + -4 = 3 3 + 21x = -3(7 + -7x) 3 + 21x = (7 * -3 + -7x * -3) 3 + 21x = (-21 + 21x) Add '-21x' to each side of the equation. 3 + 21x + -21x = -21 + 21x + -21x Combine like terms: 21x + -21x = 0 3 + 0 = -21 + 21x + -21x 3 = -21 + 21x + -21x Combine like terms: 21x + -21x = 0 3 = -21 + 0 3 = -21 Solving 3 = -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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