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Simplifying 2 * -2 + -1(a + 1) = a Multiply 2 * -2 -4 + -1(a + 1) = a Reorder the terms: -4 + -1(1 + a) = a -4 + (1 * -1 + a * -1) = a -4 + (-1 + -1a) = a Combine like terms: -4 + -1 = -5 -5 + -1a = a Solving -5 + -1a = a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. -5 + -1a + -1a = a + -1a Combine like terms: -1a + -1a = -2a -5 + -2a = a + -1a Combine like terms: a + -1a = 0 -5 + -2a = 0 Add '5' to each side of the equation. -5 + 5 + -2a = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -2a = 0 + 5 -2a = 0 + 5 Combine like terms: 0 + 5 = 5 -2a = 5 Divide each side by '-2'. a = -2.5 Simplifying a = -2.5
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