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Simplifying x + -7x + 3 = 21 Reorder the terms: 3 + x + -7x = 21 Combine like terms: x + -7x = -6x 3 + -6x = 21 Solving 3 + -6x = 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 + -6x = 21 + -3 Combine like terms: 3 + -3 = 0 0 + -6x = 21 + -3 -6x = 21 + -3 Combine like terms: 21 + -3 = 18 -6x = 18 Divide each side by '-6'. x = -3 Simplifying x = -3
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