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Simplifying -243 = -9(10 + a) -243 = (10 * -9 + a * -9) -243 = (-90 + -9a) Solving -243 = -90 + -9a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '9a' to each side of the equation. -243 + 9a = -90 + -9a + 9a Combine like terms: -9a + 9a = 0 -243 + 9a = -90 + 0 -243 + 9a = -90 Add '243' to each side of the equation. -243 + 243 + 9a = -90 + 243 Combine like terms: -243 + 243 = 0 0 + 9a = -90 + 243 9a = -90 + 243 Combine like terms: -90 + 243 = 153 9a = 153 Divide each side by '9'. a = 17 Simplifying a = 17
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