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Simplifying 7(1 + x) + 6x = 85 (1 * 7 + x * 7) + 6x = 85 (7 + 7x) + 6x = 85 Combine like terms: 7x + 6x = 13x 7 + 13x = 85 Solving 7 + 13x = 85 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 13x = 85 + -7 Combine like terms: 7 + -7 = 0 0 + 13x = 85 + -7 13x = 85 + -7 Combine like terms: 85 + -7 = 78 13x = 78 Divide each side by '13'. x = 6 Simplifying x = 6
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