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Simplifying 72 + -1(3a + -4) = 12 Reorder the terms: 72 + -1(-4 + 3a) = 12 72 + (-4 * -1 + 3a * -1) = 12 72 + (4 + -3a) = 12 Combine like terms: 72 + 4 = 76 76 + -3a = 12 Solving 76 + -3a = 12 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-76' to each side of the equation. 76 + -76 + -3a = 12 + -76 Combine like terms: 76 + -76 = 0 0 + -3a = 12 + -76 -3a = 12 + -76 Combine like terms: 12 + -76 = -64 -3a = -64 Divide each side by '-3'. a = 21.33333333 Simplifying a = 21.33333333
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