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Simplifying 4x + 15 + -9x = -7(x + -2) + 2x + 1 Reorder the terms: 15 + 4x + -9x = -7(x + -2) + 2x + 1 Combine like terms: 4x + -9x = -5x 15 + -5x = -7(x + -2) + 2x + 1 Reorder the terms: 15 + -5x = -7(-2 + x) + 2x + 1 15 + -5x = (-2 * -7 + x * -7) + 2x + 1 15 + -5x = (14 + -7x) + 2x + 1 Reorder the terms: 15 + -5x = 14 + 1 + -7x + 2x Combine like terms: 14 + 1 = 15 15 + -5x = 15 + -7x + 2x Combine like terms: -7x + 2x = -5x 15 + -5x = 15 + -5x Add '-15' to each side of the equation. 15 + -15 + -5x = 15 + -15 + -5x Combine like terms: 15 + -15 = 0 0 + -5x = 15 + -15 + -5x -5x = 15 + -15 + -5x Combine like terms: 15 + -15 = 0 -5x = 0 + -5x -5x = -5x Add '5x' to each side of the equation. -5x + 5x = -5x + 5x Combine like terms: -5x + 5x = 0 0 = -5x + 5x Combine like terms: -5x + 5x = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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