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Simplifying 81 + -4x = -99 + 8x Solving 81 + -4x = -99 + 8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8x' to each side of the equation. 81 + -4x + -8x = -99 + 8x + -8x Combine like terms: -4x + -8x = -12x 81 + -12x = -99 + 8x + -8x Combine like terms: 8x + -8x = 0 81 + -12x = -99 + 0 81 + -12x = -99 Add '-81' to each side of the equation. 81 + -81 + -12x = -99 + -81 Combine like terms: 81 + -81 = 0 0 + -12x = -99 + -81 -12x = -99 + -81 Combine like terms: -99 + -81 = -180 -12x = -180 Divide each side by '-12'. x = 15 Simplifying x = 15
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