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Simplifying 10x + 140 = x + 2(10 + x) Reorder the terms: 140 + 10x = x + 2(10 + x) 140 + 10x = x + (10 * 2 + x * 2) 140 + 10x = x + (20 + 2x) Reorder the terms: 140 + 10x = 20 + x + 2x Combine like terms: x + 2x = 3x 140 + 10x = 20 + 3x Solving 140 + 10x = 20 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 140 + 10x + -3x = 20 + 3x + -3x Combine like terms: 10x + -3x = 7x 140 + 7x = 20 + 3x + -3x Combine like terms: 3x + -3x = 0 140 + 7x = 20 + 0 140 + 7x = 20 Add '-140' to each side of the equation. 140 + -140 + 7x = 20 + -140 Combine like terms: 140 + -140 = 0 0 + 7x = 20 + -140 7x = 20 + -140 Combine like terms: 20 + -140 = -120 7x = -120 Divide each side by '7'. x = -17.14285714 Simplifying x = -17.14285714
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