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Simplifying -2a + 7 + 3a = 12 + -21 Reorder the terms: 7 + -2a + 3a = 12 + -21 Combine like terms: -2a + 3a = 1a 7 + 1a = 12 + -21 Combine like terms: 12 + -21 = -9 7 + 1a = -9 Solving 7 + 1a = -9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 1a = -9 + -7 Combine like terms: 7 + -7 = 0 0 + 1a = -9 + -7 1a = -9 + -7 Combine like terms: -9 + -7 = -16 1a = -16 Divide each side by '1'. a = -16 Simplifying a = -16
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