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Simplifying 133 = 0.7(220 + -1a) 133 = (220 * 0.7 + -1a * 0.7) 133 = (154 + -0.7a) Solving 133 = 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. 133 + 0.7a = 154 + -0.7a + 0.7a Combine like terms: -0.7a + 0.7a = 0.0 133 + 0.7a = 154 + 0.0 133 + 0.7a = 154 Add '-133' to each side of the equation. 133 + -133 + 0.7a = 154 + -133 Combine like terms: 133 + -133 = 0 0 + 0.7a = 154 + -133 0.7a = 154 + -133 Combine like terms: 154 + -133 = 21 0.7a = 21 Divide each side by '0.7'. a = 30 Simplifying a = 30
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