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Simplifying -12 = 3a + -5a Combine like terms: 3a + -5a = -2a -12 = -2a Solving -12 = -2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2a' to each side of the equation. -12 + 2a = -2a + 2a Combine like terms: -2a + 2a = 0 -12 + 2a = 0 Add '12' to each side of the equation. -12 + 12 + 2a = 0 + 12 Combine like terms: -12 + 12 = 0 0 + 2a = 0 + 12 2a = 0 + 12 Combine like terms: 0 + 12 = 12 2a = 12 Divide each side by '2'. a = 6 Simplifying a = 6
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