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Simplifying 81 = -4x + -7(-2x + -3) Reorder the terms: 81 = -4x + -7(-3 + -2x) 81 = -4x + (-3 * -7 + -2x * -7) 81 = -4x + (21 + 14x) Reorder the terms: 81 = 21 + -4x + 14x Combine like terms: -4x + 14x = 10x 81 = 21 + 10x Solving 81 = 21 + 10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10x' to each side of the equation. 81 + -10x = 21 + 10x + -10x Combine like terms: 10x + -10x = 0 81 + -10x = 21 + 0 81 + -10x = 21 Add '-81' to each side of the equation. 81 + -81 + -10x = 21 + -81 Combine like terms: 81 + -81 = 0 0 + -10x = 21 + -81 -10x = 21 + -81 Combine like terms: 21 + -81 = -60 -10x = -60 Divide each side by '-10'. x = 6 Simplifying x = 6
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