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Simplifying 5 + -2(a + -2) = -1 Reorder the terms: 5 + -2(-2 + a) = -1 5 + (-2 * -2 + a * -2) = -1 5 + (4 + -2a) = -1 Combine like terms: 5 + 4 = 9 9 + -2a = -1 Solving 9 + -2a = -1 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -2a = -1 + -9 Combine like terms: 9 + -9 = 0 0 + -2a = -1 + -9 -2a = -1 + -9 Combine like terms: -1 + -9 = -10 -2a = -10 Divide each side by '-2'. a = 5 Simplifying a = 5
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