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Simplifying 30a + 7d = 120 Solving 30a + 7d = 120 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7d' to each side of the equation. 30a + 7d + -7d = 120 + -7d Combine like terms: 7d + -7d = 0 30a + 0 = 120 + -7d 30a = 120 + -7d Divide each side by '30'. a = 4 + -0.2333333333d Simplifying a = 4 + -0.2333333333d
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