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Simplifying -7x + -2(-7x + 9) = -81 Reorder the terms: -7x + -2(9 + -7x) = -81 -7x + (9 * -2 + -7x * -2) = -81 -7x + (-18 + 14x) = -81 Reorder the terms: -18 + -7x + 14x = -81 Combine like terms: -7x + 14x = 7x -18 + 7x = -81 Solving -18 + 7x = -81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + 7x = -81 + 18 Combine like terms: -18 + 18 = 0 0 + 7x = -81 + 18 7x = -81 + 18 Combine like terms: -81 + 18 = -63 7x = -63 Divide each side by '7'. x = -9 Simplifying x = -9
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