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Simplifying -5(3 + -1a) = -3(2 + -9) (3 * -5 + -1a * -5) = -3(2 + -9) (-15 + 5a) = -3(2 + -9) Combine like terms: 2 + -9 = -7 -15 + 5a = -3(-7) Multiply -3 * -7 -15 + 5a = 21 Solving -15 + 5a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 5a = 21 + 15 Combine like terms: -15 + 15 = 0 0 + 5a = 21 + 15 5a = 21 + 15 Combine like terms: 21 + 15 = 36 5a = 36 Divide each side by '5'. a = 7.2 Simplifying a = 7.2
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