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Simplifying 7x + -7 + -4x = 20 Reorder the terms: -7 + 7x + -4x = 20 Combine like terms: 7x + -4x = 3x -7 + 3x = 20 Solving -7 + 3x = 20 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 + 3x = 20 + 7 Combine like terms: -7 + 7 = 0 0 + 3x = 20 + 7 3x = 20 + 7 Combine like terms: 20 + 7 = 27 3x = 27 Divide each side by '3'. x = 9 Simplifying x = 9
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