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Simplifying -81 + 12x = 90 + 3x Solving -81 + 12x = 90 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -81 + 12x + -3x = 90 + 3x + -3x Combine like terms: 12x + -3x = 9x -81 + 9x = 90 + 3x + -3x Combine like terms: 3x + -3x = 0 -81 + 9x = 90 + 0 -81 + 9x = 90 Add '81' to each side of the equation. -81 + 81 + 9x = 90 + 81 Combine like terms: -81 + 81 = 0 0 + 9x = 90 + 81 9x = 90 + 81 Combine like terms: 90 + 81 = 171 9x = 171 Divide each side by '9'. x = 19 Simplifying x = 19
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