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Simplifying -7x + -9 = -15x + -81 Reorder the terms: -9 + -7x = -15x + -81 Reorder the terms: -9 + -7x = -81 + -15x Solving -9 + -7x = -81 + -15x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15x' to each side of the equation. -9 + -7x + 15x = -81 + -15x + 15x Combine like terms: -7x + 15x = 8x -9 + 8x = -81 + -15x + 15x Combine like terms: -15x + 15x = 0 -9 + 8x = -81 + 0 -9 + 8x = -81 Add '9' to each side of the equation. -9 + 9 + 8x = -81 + 9 Combine like terms: -9 + 9 = 0 0 + 8x = -81 + 9 8x = -81 + 9 Combine like terms: -81 + 9 = -72 8x = -72 Divide each side by '8'. x = -9 Simplifying x = -9
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