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Simplifying 90 + -3x = 3x + 12 Reorder the terms: 90 + -3x = 12 + 3x Solving 90 + -3x = 12 + 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 = 12 + 3x + -3x Combine like terms: -3x + -3x = -6x 90 + -6x = 12 + 3x + -3x Combine like terms: 3x + -3x = 0 90 + -6x = 12 + 0 90 + -6x = 12 Add '-90' to each side of the equation. 90 + -90 + -6x = 12 + -90 Combine like terms: 90 + -90 = 0 0 + -6x = 12 + -90 -6x = 12 + -90 Combine like terms: 12 + -90 = -78 -6x = -78 Divide each side by '-6'. x = 13 Simplifying x = 13
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