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Simplifying 7x + -2x + -15 = 20 Reorder the terms: -15 + 7x + -2x = 20 Combine like terms: 7x + -2x = 5x -15 + 5x = 20 Solving -15 + 5x = 20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 5x = 20 + 15 Combine like terms: -15 + 15 = 0 0 + 5x = 20 + 15 5x = 20 + 15 Combine like terms: 20 + 15 = 35 5x = 35 Divide each side by '5'. x = 7 Simplifying x = 7
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