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Simplifying 3x + 15 + -7x = 20 + -17x + 13x + -5 Reorder the terms: 15 + 3x + -7x = 20 + -17x + 13x + -5 Combine like terms: 3x + -7x = -4x 15 + -4x = 20 + -17x + 13x + -5 Reorder the terms: 15 + -4x = 20 + -5 + -17x + 13x Combine like terms: 20 + -5 = 15 15 + -4x = 15 + -17x + 13x Combine like terms: -17x + 13x = -4x 15 + -4x = 15 + -4x Add '-15' to each side of the equation. 15 + -15 + -4x = 15 + -15 + -4x Combine like terms: 15 + -15 = 0 0 + -4x = 15 + -15 + -4x -4x = 15 + -15 + -4x Combine like terms: 15 + -15 = 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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