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Simplifying -243 = -90x + 9x Combine like terms: -90x + 9x = -81x -243 = -81x Solving -243 = -81x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '81x' to each side of the equation. -243 + 81x = -81x + 81x Combine like terms: -81x + 81x = 0 -243 + 81x = 0 Add '243' to each side of the equation. -243 + 243 + 81x = 0 + 243 Combine like terms: -243 + 243 = 0 0 + 81x = 0 + 243 81x = 0 + 243 Combine like terms: 0 + 243 = 243 81x = 243 Divide each side by '81'. x = 3 Simplifying x = 3
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