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Simplifying -81 = 6x + -13x + -18 Reorder the terms: -81 = -18 + 6x + -13x Combine like terms: 6x + -13x = -7x -81 = -18 + -7x Solving -81 = -18 + -7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7x' to each side of the equation. -81 + 7x = -18 + -7x + 7x Combine like terms: -7x + 7x = 0 -81 + 7x = -18 + 0 -81 + 7x = -18 Add '81' to each side of the equation. -81 + 81 + 7x = -18 + 81 Combine like terms: -81 + 81 = 0 0 + 7x = -18 + 81 7x = -18 + 81 Combine like terms: -18 + 81 = 63 7x = 63 Divide each side by '7'. x = 9 Simplifying x = 9
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