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Simplifying 20a + 12 + 11a = -47 Reorder the terms: 12 + 20a + 11a = -47 Combine like terms: 20a + 11a = 31a 12 + 31a = -47 Solving 12 + 31a = -47 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 31a = -47 + -12 Combine like terms: 12 + -12 = 0 0 + 31a = -47 + -12 31a = -47 + -12 Combine like terms: -47 + -12 = -59 31a = -59 Divide each side by '31'. a = -1.903225806 Simplifying a = -1.903225806
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