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Simplifying -84 + 7x = 81 + -4x Solving -84 + 7x = 81 + -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. -84 + 7x + 4x = 81 + -4x + 4x Combine like terms: 7x + 4x = 11x -84 + 11x = 81 + -4x + 4x Combine like terms: -4x + 4x = 0 -84 + 11x = 81 + 0 -84 + 11x = 81 Add '84' to each side of the equation. -84 + 84 + 11x = 81 + 84 Combine like terms: -84 + 84 = 0 0 + 11x = 81 + 84 11x = 81 + 84 Combine like terms: 81 + 84 = 165 11x = 165 Divide each side by '11'. x = 15 Simplifying x = 15
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