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Simplifying -3(5 + -2.5a) = 0.75 (5 * -3 + -2.5a * -3) = 0.75 (-15 + 7.5a) = 0.75 Solving -15 + 7.5a = 0.75 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 + 7.5a = 0.75 + 15 Combine like terms: -15 + 15 = 0 0 + 7.5a = 0.75 + 15 7.5a = 0.75 + 15 Combine like terms: 0.75 + 15 = 15.75 7.5a = 15.75 Divide each side by '7.5'. a = 2.1 Simplifying a = 2.1
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