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Simplifying 21x + -1x + -3 = 7 Reorder the terms: -3 + 21x + -1x = 7 Combine like terms: 21x + -1x = 20x -3 + 20x = 7 Solving -3 + 20x = 7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 20x = 7 + 3 Combine like terms: -3 + 3 = 0 0 + 20x = 7 + 3 20x = 7 + 3 Combine like terms: 7 + 3 = 10 20x = 10 Divide each side by '20'. x = 0.5 Simplifying x = 0.5
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