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Simplifying 4(a + 3) = a + -15 Reorder the terms: 4(3 + a) = a + -15 (3 * 4 + a * 4) = a + -15 (12 + 4a) = a + -15 Reorder the terms: 12 + 4a = -15 + a Solving 12 + 4a = -15 + a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. 12 + 4a + -1a = -15 + a + -1a Combine like terms: 4a + -1a = 3a 12 + 3a = -15 + a + -1a Combine like terms: a + -1a = 0 12 + 3a = -15 + 0 12 + 3a = -15 Add '-12' to each side of the equation. 12 + -12 + 3a = -15 + -12 Combine like terms: 12 + -12 = 0 0 + 3a = -15 + -12 3a = -15 + -12 Combine like terms: -15 + -12 = -27 3a = -27 Divide each side by '3'. a = -9 Simplifying a = -9
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