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Simplifying 3x + 18 + -7x = 20 + -17x + 13x + -2 Reorder the terms: 18 + 3x + -7x = 20 + -17x + 13x + -2 Combine like terms: 3x + -7x = -4x 18 + -4x = 20 + -17x + 13x + -2 Reorder the terms: 18 + -4x = 20 + -2 + -17x + 13x Combine like terms: 20 + -2 = 18 18 + -4x = 18 + -17x + 13x Combine like terms: -17x + 13x = -4x 18 + -4x = 18 + -4x Add '-18' to each side of the equation. 18 + -18 + -4x = 18 + -18 + -4x Combine like terms: 18 + -18 = 0 0 + -4x = 18 + -18 + -4x -4x = 18 + -18 + -4x Combine like terms: 18 + -18 = 0 -4x = 0 + -4x -4x = -4x Add '4x' to each side of the equation. -4x + 4x = -4x + 4x Combine like terms: -4x + 4x = 0 0 = -4x + 4x Combine like terms: -4x + 4x = 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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