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Simplifying 81 + -5 = 7x + 21 Combine like terms: 81 + -5 = 76 76 = 7x + 21 Reorder the terms: 76 = 21 + 7x Solving 76 = 21 + 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. 76 + -7x = 21 + 7x + -7x Combine like terms: 7x + -7x = 0 76 + -7x = 21 + 0 76 + -7x = 21 Add '-76' to each side of the equation. 76 + -76 + -7x = 21 + -76 Combine like terms: 76 + -76 = 0 0 + -7x = 21 + -76 -7x = 21 + -76 Combine like terms: 21 + -76 = -55 -7x = -55 Divide each side by '-7'. x = 7.857142857 Simplifying x = 7.857142857
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