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Simplifying 3 + -9 = 4a + 12 Combine like terms: 3 + -9 = -6 -6 = 4a + 12 Reorder the terms: -6 = 12 + 4a Solving -6 = 12 + 4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4a' to each side of the equation. -6 + -4a = 12 + 4a + -4a Combine like terms: 4a + -4a = 0 -6 + -4a = 12 + 0 -6 + -4a = 12 Add '6' to each side of the equation. -6 + 6 + -4a = 12 + 6 Combine like terms: -6 + 6 = 0 0 + -4a = 12 + 6 -4a = 12 + 6 Combine like terms: 12 + 6 = 18 -4a = 18 Divide each side by '-4'. a = -4.5 Simplifying a = -4.5
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