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Simplifying 9 + -5 + 77 + (x * 7) = 15 * 21 Reorder the terms for easier multiplication: 9 + -5 + 77 + (7x) = 15 * 21 Combine like terms: 9 + -5 = 4 4 + 77 + (7x) = 15 * 21 Combine like terms: 4 + 77 = 81 81 + (7x) = 15 * 21 Multiply 15 * 21 81 + (7x) = 315 Solving 81 + (7x) = 315 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-81' to each side of the equation. 81 + -81 + (7x) = 315 + -81 Combine like terms: 81 + -81 = 0 0 + (7x) = 315 + -81 (7x) = 315 + -81 Combine like terms: 315 + -81 = 234 (7x) = 234 Divide each side by '7'. x = 33.42857143 Simplifying x = 33.42857143
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