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