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Simplifying 5a + -2a + -5 + 1 = -12 Reorder the terms: -5 + 1 + 5a + -2a = -12 Combine like terms: -5 + 1 = -4 -4 + 5a + -2a = -12 Combine like terms: 5a + -2a = 3a -4 + 3a = -12 Solving -4 + 3a = -12 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 3a = -12 + 4 Combine like terms: -4 + 4 = 0 0 + 3a = -12 + 4 3a = -12 + 4 Combine like terms: -12 + 4 = -8 3a = -8 Divide each side by '3'. a = -2.666666667 Simplifying a = -2.666666667

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