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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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