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Simplifying 3a + 21 = 7(6 + 3) Reorder the terms: 21 + 3a = 7(6 + 3) Combine like terms: 6 + 3 = 9 21 + 3a = 7(9) Multiply 7 * 9 21 + 3a = 63 Solving 21 + 3a = 63 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 3a = 63 + -21 Combine like terms: 21 + -21 = 0 0 + 3a = 63 + -21 3a = 63 + -21 Combine like terms: 63 + -21 = 42 3a = 42 Divide each side by '3'. a = 14 Simplifying a = 14
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