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Simplifying 90 + -3x = 3x + 18 Reorder the terms: 90 + -3x = 18 + 3x Solving 90 + -3x = 18 + 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. 90 + -3x + -3x = 18 + 3x + -3x Combine like terms: -3x + -3x = -6x 90 + -6x = 18 + 3x + -3x Combine like terms: 3x + -3x = 0 90 + -6x = 18 + 0 90 + -6x = 18 Add '-90' to each side of the equation. 90 + -90 + -6x = 18 + -90 Combine like terms: 90 + -90 = 0 0 + -6x = 18 + -90 -6x = 18 + -90 Combine like terms: 18 + -90 = -72 -6x = -72 Divide each side by '-6'. x = 12 Simplifying x = 12
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