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Simplifying 18 + -4x + 7x + -12 = 3(2 + x) Reorder the terms: 18 + -12 + -4x + 7x = 3(2 + x) Combine like terms: 18 + -12 = 6 6 + -4x + 7x = 3(2 + x) Combine like terms: -4x + 7x = 3x 6 + 3x = 3(2 + x) 6 + 3x = (2 * 3 + x * 3) 6 + 3x = (6 + 3x) Add '-6' to each side of the equation. 6 + -6 + 3x = 6 + -6 + 3x Combine like terms: 6 + -6 = 0 0 + 3x = 6 + -6 + 3x 3x = 6 + -6 + 3x Combine like terms: 6 + -6 = 0 3x = 0 + 3x 3x = 3x Add '-3x' to each side of the equation. 3x + -3x = 3x + -3x Combine like terms: 3x + -3x = 0 0 = 3x + -3x Combine like terms: 3x + -3x = 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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