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Simplifying 4x + 3 + -5x + -18 = 6 + -8x + 7x + -21 Reorder the terms: 3 + -18 + 4x + -5x = 6 + -8x + 7x + -21 Combine like terms: 3 + -18 = -15 -15 + 4x + -5x = 6 + -8x + 7x + -21 Combine like terms: 4x + -5x = -1x -15 + -1x = 6 + -8x + 7x + -21 Reorder the terms: -15 + -1x = 6 + -21 + -8x + 7x Combine like terms: 6 + -21 = -15 -15 + -1x = -15 + -8x + 7x Combine like terms: -8x + 7x = -1x -15 + -1x = -15 + -1x Add '15' to each side of the equation. -15 + 15 + -1x = -15 + 15 + -1x Combine like terms: -15 + 15 = 0 0 + -1x = -15 + 15 + -1x -1x = -15 + 15 + -1x Combine like terms: -15 + 15 = 0 -1x = 0 + -1x -1x = -1x Add 'x' to each side of the equation. -1x + x = -1x + x Combine like terms: -1x + x = 0 0 = -1x + x Combine like terms: -1x + x = 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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