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Simplifying 21x + -81 = 7x + -67 Reorder the terms: -81 + 21x = 7x + -67 Reorder the terms: -81 + 21x = -67 + 7x Solving -81 + 21x = -67 + 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 + 21x + -7x = -67 + 7x + -7x Combine like terms: 21x + -7x = 14x -81 + 14x = -67 + 7x + -7x Combine like terms: 7x + -7x = 0 -81 + 14x = -67 + 0 -81 + 14x = -67 Add '81' to each side of the equation. -81 + 81 + 14x = -67 + 81 Combine like terms: -81 + 81 = 0 0 + 14x = -67 + 81 14x = -67 + 81 Combine like terms: -67 + 81 = 14 14x = 14 Divide each side by '14'. x = 1 Simplifying x = 1
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