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Simplifying 8x + 21 + -1x = 7(x + -3) Reorder the terms: 21 + 8x + -1x = 7(x + -3) Combine like terms: 8x + -1x = 7x 21 + 7x = 7(x + -3) Reorder the terms: 21 + 7x = 7(-3 + x) 21 + 7x = (-3 * 7 + x * 7) 21 + 7x = (-21 + 7x) Add '-7x' to each side of the equation. 21 + 7x + -7x = -21 + 7x + -7x Combine like terms: 7x + -7x = 0 21 + 0 = -21 + 7x + -7x 21 = -21 + 7x + -7x Combine like terms: 7x + -7x = 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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