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Simplifying -0.8(4a + -1) = 28 Reorder the terms: -0.8(-1 + 4a) = 28 (-1 * -0.8 + 4a * -0.8) = 28 (0.8 + -3.2a) = 28 Solving 0.8 + -3.2a = 28 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + -3.2a = 28 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + -3.2a = 28 + -0.8 -3.2a = 28 + -0.8 Combine like terms: 28 + -0.8 = 27.2 -3.2a = 27.2 Divide each side by '-3.2'. a = -8.5 Simplifying a = -8.5
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