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Simplifying 9x + -1(2x + 5) = 7x + -15 Reorder the terms: 9x + -1(5 + 2x) = 7x + -15 9x + (5 * -1 + 2x * -1) = 7x + -15 9x + (-5 + -2x) = 7x + -15 Reorder the terms: -5 + 9x + -2x = 7x + -15 Combine like terms: 9x + -2x = 7x -5 + 7x = 7x + -15 Reorder the terms: -5 + 7x = -15 + 7x Add '-7x' to each side of the equation. -5 + 7x + -7x = -15 + 7x + -7x Combine like terms: 7x + -7x = 0 -5 + 0 = -15 + 7x + -7x -5 = -15 + 7x + -7x Combine like terms: 7x + -7x = 0 -5 = -15 + 0 -5 = -15 Solving -5 = -15 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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