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Simplifying 12 = 3 + -3 * 4a Multiply -3 * 4 12 = 3 + -12a Solving 12 = 3 + -12a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '12a' to each side of the equation. 12 + 12a = 3 + -12a + 12a Combine like terms: -12a + 12a = 0 12 + 12a = 3 + 0 12 + 12a = 3 Add '-12' to each side of the equation. 12 + -12 + 12a = 3 + -12 Combine like terms: 12 + -12 = 0 0 + 12a = 3 + -12 12a = 3 + -12 Combine like terms: 3 + -12 = -9 12a = -9 Divide each side by '12'. a = -0.75 Simplifying a = -0.75
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