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Simplifying 81 = -1x + -7(x + -7) Reorder the terms: 81 = -1x + -7(-7 + x) 81 = -1x + (-7 * -7 + x * -7) 81 = -1x + (49 + -7x) Reorder the terms: 81 = 49 + -1x + -7x Combine like terms: -1x + -7x = -8x 81 = 49 + -8x Solving 81 = 49 + -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 + 8x = 49 + -8x + 8x Combine like terms: -8x + 8x = 0 81 + 8x = 49 + 0 81 + 8x = 49 Add '-81' to each side of the equation. 81 + -81 + 8x = 49 + -81 Combine like terms: 81 + -81 = 0 0 + 8x = 49 + -81 8x = 49 + -81 Combine like terms: 49 + -81 = -32 8x = -32 Divide each side by '8'. x = -4 Simplifying x = -4
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