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Simplifying 4x + 13 + -7x = 15 + -18x + 15x + -2 Reorder the terms: 13 + 4x + -7x = 15 + -18x + 15x + -2 Combine like terms: 4x + -7x = -3x 13 + -3x = 15 + -18x + 15x + -2 Reorder the terms: 13 + -3x = 15 + -2 + -18x + 15x Combine like terms: 15 + -2 = 13 13 + -3x = 13 + -18x + 15x Combine like terms: -18x + 15x = -3x 13 + -3x = 13 + -3x Add '-13' to each side of the equation. 13 + -13 + -3x = 13 + -13 + -3x Combine like terms: 13 + -13 = 0 0 + -3x = 13 + -13 + -3x -3x = 13 + -13 + -3x Combine like terms: 13 + -13 = 0 -3x = 0 + -3x -3x = -3x Add '3x' to each side of the equation. -3x + 3x = -3x + 3x Combine like terms: -3x + 3x = 0 0 = -3x + 3x Combine like terms: -3x + 3x = 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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