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