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Simplifying 120 = 45a + 0.7 + -21 Reorder the terms: 120 = 0.7 + -21 + 45a Combine like terms: 0.7 + -21 = -20.3 120 = -20.3 + 45a Solving 120 = -20.3 + 45a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-45a' to each side of the equation. 120 + -45a = -20.3 + 45a + -45a Combine like terms: 45a + -45a = 0 120 + -45a = -20.3 + 0 120 + -45a = -20.3 Add '-120' to each side of the equation. 120 + -120 + -45a = -20.3 + -120 Combine like terms: 120 + -120 = 0 0 + -45a = -20.3 + -120 -45a = -20.3 + -120 Combine like terms: -20.3 + -120 = -140.3 -45a = -140.3 Divide each side by '-45'. a = 3.117777778 Simplifying a = 3.117777778
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