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Simplifying 90 = -3(-2 + -4x) 90 = (-2 * -3 + -4x * -3) 90 = (6 + 12x) Solving 90 = 6 + 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 + -12x = 6 + 12x + -12x Combine like terms: 12x + -12x = 0 90 + -12x = 6 + 0 90 + -12x = 6 Add '-90' to each side of the equation. 90 + -90 + -12x = 6 + -90 Combine like terms: 90 + -90 = 0 0 + -12x = 6 + -90 -12x = 6 + -90 Combine like terms: 6 + -90 = -84 -12x = -84 Divide each side by '-12'. x = 7 Simplifying x = 7
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