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Simplifying 6x + (-90) = 12x 6x + -90 = 12x Reorder the terms: -90 + 6x = 12x Solving -90 + 6x = 12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12x' to each side of the equation. -90 + 6x + -12x = 12x + -12x Combine like terms: 6x + -12x = -6x -90 + -6x = 12x + -12x Combine like terms: 12x + -12x = 0 -90 + -6x = 0 Add '90' to each side of the equation. -90 + 90 + -6x = 0 + 90 Combine like terms: -90 + 90 = 0 0 + -6x = 0 + 90 -6x = 0 + 90 Combine like terms: 0 + 90 = 90 -6x = 90 Divide each side by '-6'. x = -15 Simplifying x = -15
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