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Simplifying 3(a + 7) = 21 + -7a Reorder the terms: 3(7 + a) = 21 + -7a (7 * 3 + a * 3) = 21 + -7a (21 + 3a) = 21 + -7a Add '-21' to each side of the equation. 21 + -21 + 3a = 21 + -21 + -7a Combine like terms: 21 + -21 = 0 0 + 3a = 21 + -21 + -7a 3a = 21 + -21 + -7a Combine like terms: 21 + -21 = 0 3a = 0 + -7a 3a = -7a Solving 3a = -7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7a' to each side of the equation. 3a + 7a = -7a + 7a Combine like terms: 3a + 7a = 10a 10a = -7a + 7a Combine like terms: -7a + 7a = 0 10a = 0 Divide each side by '10'. a = 0.0 Simplifying a = 0.0
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