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Simplifying 3[2 + q] + 15 = 21 + 3q [2 * 3 + q * 3] + 15 = 21 + 3q [6 + 3q] + 15 = 21 + 3q Reorder the terms: 6 + 15 + 3q = 21 + 3q Combine like terms: 6 + 15 = 21 21 + 3q = 21 + 3q Add '-21' to each side of the equation. 21 + -21 + 3q = 21 + -21 + 3q Combine like terms: 21 + -21 = 0 0 + 3q = 21 + -21 + 3q 3q = 21 + -21 + 3q Combine like terms: 21 + -21 = 0 3q = 0 + 3q 3q = 3q Add '-3q' to each side of the equation. 3q + -3q = 3q + -3q Combine like terms: 3q + -3q = 0 0 = 3q + -3q Combine like terms: 3q + -3q = 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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