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Simplifying 0.8(220 + -1a) = 120 (220 * 0.8 + -1a * 0.8) = 120 (176 + -0.8a) = 120 Solving 176 + -0.8a = 120 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-176' to each side of the equation. 176 + -176 + -0.8a = 120 + -176 Combine like terms: 176 + -176 = 0 0 + -0.8a = 120 + -176 -0.8a = 120 + -176 Combine like terms: 120 + -176 = -56 -0.8a = -56 Divide each side by '-0.8'. a = 70 Simplifying a = 70
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