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Simplifying -7x + -3 + 5x = 21 Reorder the terms: -3 + -7x + 5x = 21 Combine like terms: -7x + 5x = -2x -3 + -2x = 21 Solving -3 + -2x = 21 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 + -2x = 21 + 3 Combine like terms: -3 + 3 = 0 0 + -2x = 21 + 3 -2x = 21 + 3 Combine like terms: 21 + 3 = 24 -2x = 24 Divide each side by '-2'. x = -12 Simplifying x = -12
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