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Simplifying 3(x + 7) + 5x = 8x + -21 Reorder the terms: 3(7 + x) + 5x = 8x + -21 (7 * 3 + x * 3) + 5x = 8x + -21 (21 + 3x) + 5x = 8x + -21 Combine like terms: 3x + 5x = 8x 21 + 8x = 8x + -21 Reorder the terms: 21 + 8x = -21 + 8x Add '-8x' to each side of the equation. 21 + 8x + -8x = -21 + 8x + -8x Combine like terms: 8x + -8x = 0 21 + 0 = -21 + 8x + -8x 21 = -21 + 8x + -8x Combine like terms: 8x + -8x = 0 21 = -21 + 0 21 = -21 Solving 21 = -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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