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Simplifying 15 = -7a(4 + 3) Combine like terms: 4 + 3 = 7 15 = -7a(7) Reorder the terms for easier multiplication: 15 = -7 * 7a Multiply -7 * 7 15 = -49a Solving 15 = -49a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '49a' to each side of the equation. 15 + 49a = -49a + 49a Combine like terms: -49a + 49a = 0 15 + 49a = 0 Add '-15' to each side of the equation. 15 + -15 + 49a = 0 + -15 Combine like terms: 15 + -15 = 0 0 + 49a = 0 + -15 49a = 0 + -15 Combine like terms: 0 + -15 = -15 49a = -15 Divide each side by '49'. a = -0.306122449 Simplifying a = -0.306122449
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