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Simplifying 7(4x + 3) + -13x = 81 Reorder the terms: 7(3 + 4x) + -13x = 81 (3 * 7 + 4x * 7) + -13x = 81 (21 + 28x) + -13x = 81 Combine like terms: 28x + -13x = 15x 21 + 15x = 81 Solving 21 + 15x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 15x = 81 + -21 Combine like terms: 21 + -21 = 0 0 + 15x = 81 + -21 15x = 81 + -21 Combine like terms: 81 + -21 = 60 15x = 60 Divide each side by '15'. x = 4 Simplifying x = 4
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