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Simplifying -9 = 3 + -1(10 + -1a) -9 = 3 + (10 * -1 + -1a * -1) -9 = 3 + (-10 + 1a) Combine like terms: 3 + -10 = -7 -9 = -7 + 1a Solving -9 = -7 + 1a 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. -9 + -1a = -7 + 1a + -1a Combine like terms: 1a + -1a = 0 -9 + -1a = -7 + 0 -9 + -1a = -7 Add '9' to each side of the equation. -9 + 9 + -1a = -7 + 9 Combine like terms: -9 + 9 = 0 0 + -1a = -7 + 9 -1a = -7 + 9 Combine like terms: -7 + 9 = 2 -1a = 2 Divide each side by '-1'. a = -2 Simplifying a = -2
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