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Simplifying 4 + 5x = -2x + 81 Reorder the terms: 4 + 5x = 81 + -2x Solving 4 + 5x = 81 + -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. 4 + 5x + 2x = 81 + -2x + 2x Combine like terms: 5x + 2x = 7x 4 + 7x = 81 + -2x + 2x Combine like terms: -2x + 2x = 0 4 + 7x = 81 + 0 4 + 7x = 81 Add '-4' to each side of the equation. 4 + -4 + 7x = 81 + -4 Combine like terms: 4 + -4 = 0 0 + 7x = 81 + -4 7x = 81 + -4 Combine like terms: 81 + -4 = 77 7x = 77 Divide each side by '7'. x = 11 Simplifying x = 11
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