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Simplifying 3 = 2.5(8 + a) 3 = (8 * 2.5 + a * 2.5) 3 = (20 + 2.5a) Solving 3 = 20 + 2.5a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2.5a' to each side of the equation. 3 + -2.5a = 20 + 2.5a + -2.5a Combine like terms: 2.5a + -2.5a = 0.0 3 + -2.5a = 20 + 0.0 3 + -2.5a = 20 Add '-3' to each side of the equation. 3 + -3 + -2.5a = 20 + -3 Combine like terms: 3 + -3 = 0 0 + -2.5a = 20 + -3 -2.5a = 20 + -3 Combine like terms: 20 + -3 = 17 -2.5a = 17 Divide each side by '-2.5'. a = -6.8 Simplifying a = -6.8
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