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Simplifying 5 + -7x + 15 = 5x + 20 + -12x Reorder the terms: 5 + 15 + -7x = 5x + 20 + -12x Combine like terms: 5 + 15 = 20 20 + -7x = 5x + 20 + -12x Reorder the terms: 20 + -7x = 20 + 5x + -12x Combine like terms: 5x + -12x = -7x 20 + -7x = 20 + -7x Add '-20' to each side of the equation. 20 + -20 + -7x = 20 + -20 + -7x Combine like terms: 20 + -20 = 0 0 + -7x = 20 + -20 + -7x -7x = 20 + -20 + -7x Combine like terms: 20 + -20 = 0 -7x = 0 + -7x -7x = -7x Add '7x' to each side of the equation. -7x + 7x = -7x + 7x Combine like terms: -7x + 7x = 0 0 = -7x + 7x Combine like terms: -7x + 7x = 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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