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Simplifying 100 = 0.7(220 + -1a) 100 = (220 * 0.7 + -1a * 0.7) 100 = (154 + -0.7a) Solving 100 = 154 + -0.7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.7a' to each side of the equation. 100 + 0.7a = 154 + -0.7a + 0.7a Combine like terms: -0.7a + 0.7a = 0.0 100 + 0.7a = 154 + 0.0 100 + 0.7a = 154 Add '-100' to each side of the equation. 100 + -100 + 0.7a = 154 + -100 Combine like terms: 100 + -100 = 0 0 + 0.7a = 154 + -100 0.7a = 154 + -100 Combine like terms: 154 + -100 = 54 0.7a = 54 Divide each side by '0.7'. a = 77.14285714 Simplifying a = 77.14285714
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