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Simplifying a + 21 = 3(-3a + 7) Reorder the terms: 21 + a = 3(-3a + 7) Reorder the terms: 21 + a = 3(7 + -3a) 21 + a = (7 * 3 + -3a * 3) 21 + a = (21 + -9a) Add '-21' to each side of the equation. 21 + -21 + a = 21 + -21 + -9a Combine like terms: 21 + -21 = 0 0 + a = 21 + -21 + -9a a = 21 + -21 + -9a Combine like terms: 21 + -21 = 0 a = 0 + -9a a = -9a Solving a = -9a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '9a' to each side of the equation. a + 9a = -9a + 9a Combine like terms: a + 9a = 10a 10a = -9a + 9a Combine like terms: -9a + 9a = 0 10a = 0 Divide each side by '10'. a = 0.0 Simplifying a = 0.0
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