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Simplifying 40 = -4(1 + a) 40 = (1 * -4 + a * -4) 40 = (-4 + -4a) Solving 40 = -4 + -4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '4a' to each side of the equation. 40 + 4a = -4 + -4a + 4a Combine like terms: -4a + 4a = 0 40 + 4a = -4 + 0 40 + 4a = -4 Add '-40' to each side of the equation. 40 + -40 + 4a = -4 + -40 Combine like terms: 40 + -40 = 0 0 + 4a = -4 + -40 4a = -4 + -40 Combine like terms: -4 + -40 = -44 4a = -44 Divide each side by '4'. a = -11 Simplifying a = -11
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