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Simplifying 2x + 3x + -9 = 90 + 12x + -18x Reorder the terms: -9 + 2x + 3x = 90 + 12x + -18x Combine like terms: 2x + 3x = 5x -9 + 5x = 90 + 12x + -18x Combine like terms: 12x + -18x = -6x -9 + 5x = 90 + -6x Solving -9 + 5x = 90 + -6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6x' to each side of the equation. -9 + 5x + 6x = 90 + -6x + 6x Combine like terms: 5x + 6x = 11x -9 + 11x = 90 + -6x + 6x Combine like terms: -6x + 6x = 0 -9 + 11x = 90 + 0 -9 + 11x = 90 Add '9' to each side of the equation. -9 + 9 + 11x = 90 + 9 Combine like terms: -9 + 9 = 0 0 + 11x = 90 + 9 11x = 90 + 9 Combine like terms: 90 + 9 = 99 11x = 99 Divide each side by '11'. x = 9 Simplifying x = 9
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