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Simplifying x + -15 = 20 + -4x Reorder the terms: -15 + x = 20 + -4x Solving -15 + x = 20 + -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. -15 + x + 4x = 20 + -4x + 4x Combine like terms: x + 4x = 5x -15 + 5x = 20 + -4x + 4x Combine like terms: -4x + 4x = 0 -15 + 5x = 20 + 0 -15 + 5x = 20 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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