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Simplifying -81 = 4(-4 + 3x) + 7 -81 = (-4 * 4 + 3x * 4) + 7 -81 = (-16 + 12x) + 7 Reorder the terms: -81 = -16 + 7 + 12x Combine like terms: -16 + 7 = -9 -81 = -9 + 12x Solving -81 = -9 + 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. -81 + -12x = -9 + 12x + -12x Combine like terms: 12x + -12x = 0 -81 + -12x = -9 + 0 -81 + -12x = -9 Add '81' to each side of the equation. -81 + 81 + -12x = -9 + 81 Combine like terms: -81 + 81 = 0 0 + -12x = -9 + 81 -12x = -9 + 81 Combine like terms: -9 + 81 = 72 -12x = 72 Divide each side by '-12'. x = -6 Simplifying x = -6
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