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Simplifying 120 = 0.7a + -21 Reorder the terms: 120 = -21 + 0.7a Solving 120 = -21 + 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. 120 + -0.7a = -21 + 0.7a + -0.7a Combine like terms: 0.7a + -0.7a = 0.0 120 + -0.7a = -21 + 0.0 120 + -0.7a = -21 Add '-120' to each side of the equation. 120 + -120 + -0.7a = -21 + -120 Combine like terms: 120 + -120 = 0 0 + -0.7a = -21 + -120 -0.7a = -21 + -120 Combine like terms: -21 + -120 = -141 -0.7a = -141 Divide each side by '-0.7'. a = 201.4285714 Simplifying a = 201.4285714
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