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Simplifying 120 = 0.6(220 + -1a) 120 = (220 * 0.6 + -1a * 0.6) 120 = (132 + -0.6a) Solving 120 = 132 + -0.6a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.6a' to each side of the equation. 120 + 0.6a = 132 + -0.6a + 0.6a Combine like terms: -0.6a + 0.6a = 0.0 120 + 0.6a = 132 + 0.0 120 + 0.6a = 132 Add '-120' to each side of the equation. 120 + -120 + 0.6a = 132 + -120 Combine like terms: 120 + -120 = 0 0 + 0.6a = 132 + -120 0.6a = 132 + -120 Combine like terms: 132 + -120 = 12 0.6a = 12 Divide each side by '0.6'. a = 20 Simplifying a = 20
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