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Simplifying 81 + -63 + -6 = 18 + 2a + 18 Combine like terms: 81 + -63 = 18 18 + -6 = 18 + 2a + 18 Combine like terms: 18 + -6 = 12 12 = 18 + 2a + 18 Reorder the terms: 12 = 18 + 18 + 2a Combine like terms: 18 + 18 = 36 12 = 36 + 2a Solving 12 = 36 + 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 = 36 + 2a + -2a Combine like terms: 2a + -2a = 0 12 + -2a = 36 + 0 12 + -2a = 36 Add '-12' to each side of the equation. 12 + -12 + -2a = 36 + -12 Combine like terms: 12 + -12 = 0 0 + -2a = 36 + -12 -2a = 36 + -12 Combine like terms: 36 + -12 = 24 -2a = 24 Divide each side by '-2'. a = -12 Simplifying a = -12
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