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Simplifying 3(x + 6) + -1 = 21 + -4x + -4 + 7x Reorder the terms: 3(6 + x) + -1 = 21 + -4x + -4 + 7x (6 * 3 + x * 3) + -1 = 21 + -4x + -4 + 7x (18 + 3x) + -1 = 21 + -4x + -4 + 7x Reorder the terms: 18 + -1 + 3x = 21 + -4x + -4 + 7x Combine like terms: 18 + -1 = 17 17 + 3x = 21 + -4x + -4 + 7x Reorder the terms: 17 + 3x = 21 + -4 + -4x + 7x Combine like terms: 21 + -4 = 17 17 + 3x = 17 + -4x + 7x Combine like terms: -4x + 7x = 3x 17 + 3x = 17 + 3x Add '-17' to each side of the equation. 17 + -17 + 3x = 17 + -17 + 3x Combine like terms: 17 + -17 = 0 0 + 3x = 17 + -17 + 3x 3x = 17 + -17 + 3x Combine like terms: 17 + -17 = 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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