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Simplifying 90 + -6x = 21x + 18 Reorder the terms: 90 + -6x = 18 + 21x Solving 90 + -6x = 18 + 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. 90 + -6x + -21x = 18 + 21x + -21x Combine like terms: -6x + -21x = -27x 90 + -27x = 18 + 21x + -21x Combine like terms: 21x + -21x = 0 90 + -27x = 18 + 0 90 + -27x = 18 Add '-90' to each side of the equation. 90 + -90 + -27x = 18 + -90 Combine like terms: 90 + -90 = 0 0 + -27x = 18 + -90 -27x = 18 + -90 Combine like terms: 18 + -90 = -72 -27x = -72 Divide each side by '-27'. x = 2.666666667 Simplifying x = 2.666666667
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