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Simplifying 3x + 12 + -7x = 20 + -19x + 15x + -8 Reorder the terms: 12 + 3x + -7x = 20 + -19x + 15x + -8 Combine like terms: 3x + -7x = -4x 12 + -4x = 20 + -19x + 15x + -8 Reorder the terms: 12 + -4x = 20 + -8 + -19x + 15x Combine like terms: 20 + -8 = 12 12 + -4x = 12 + -19x + 15x Combine like terms: -19x + 15x = -4x 12 + -4x = 12 + -4x Add '-12' to each side of the equation. 12 + -12 + -4x = 12 + -12 + -4x Combine like terms: 12 + -12 = 0 0 + -4x = 12 + -12 + -4x -4x = 12 + -12 + -4x Combine like terms: 12 + -12 = 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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