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Simplifying 152 = 0.8(220 + -1a) 152 = (220 * 0.8 + -1a * 0.8) 152 = (176 + -0.8a) Solving 152 = 176 + -0.8a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.8a' to each side of the equation. 152 + 0.8a = 176 + -0.8a + 0.8a Combine like terms: -0.8a + 0.8a = 0.0 152 + 0.8a = 176 + 0.0 152 + 0.8a = 176 Add '-152' to each side of the equation. 152 + -152 + 0.8a = 176 + -152 Combine like terms: 152 + -152 = 0 0 + 0.8a = 176 + -152 0.8a = 176 + -152 Combine like terms: 176 + -152 = 24 0.8a = 24 Divide each side by '0.8'. a = 30 Simplifying a = 30
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