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Simplifying 5x + 7x + 1 + 7x + 6 = 140 Reorder the terms: 1 + 6 + 5x + 7x + 7x = 140 Combine like terms: 1 + 6 = 7 7 + 5x + 7x + 7x = 140 Combine like terms: 5x + 7x = 12x 7 + 12x + 7x = 140 Combine like terms: 12x + 7x = 19x 7 + 19x = 140 Solving 7 + 19x = 140 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 + 19x = 140 + -7 Combine like terms: 7 + -7 = 0 0 + 19x = 140 + -7 19x = 140 + -7 Combine like terms: 140 + -7 = 133 19x = 133 Divide each side by '19'. x = 7 Simplifying x = 7
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