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Simplifying -15x + 18 = -15x + 21 Reorder the terms: 18 + -15x = -15x + 21 Reorder the terms: 18 + -15x = 21 + -15x Add '15x' to each side of the equation. 18 + -15x + 15x = 21 + -15x + 15x Combine like terms: -15x + 15x = 0 18 + 0 = 21 + -15x + 15x 18 = 21 + -15x + 15x Combine like terms: -15x + 15x = 0 18 = 21 + 0 18 = 21 Solving 18 = 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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