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Simplifying 13x + -18 = 9x + 2(2x + -9) Reorder the terms: -18 + 13x = 9x + 2(2x + -9) Reorder the terms: -18 + 13x = 9x + 2(-9 + 2x) -18 + 13x = 9x + (-9 * 2 + 2x * 2) -18 + 13x = 9x + (-18 + 4x) Reorder the terms: -18 + 13x = -18 + 9x + 4x Combine like terms: 9x + 4x = 13x -18 + 13x = -18 + 13x Add '18' to each side of the equation. -18 + 18 + 13x = -18 + 18 + 13x Combine like terms: -18 + 18 = 0 0 + 13x = -18 + 18 + 13x 13x = -18 + 18 + 13x Combine like terms: -18 + 18 = 0 13x = 0 + 13x 13x = 13x Add '-13x' to each side of the equation. 13x + -13x = 13x + -13x Combine like terms: 13x + -13x = 0 0 = 13x + -13x Combine like terms: 13x + -13x = 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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