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Simplifying 21 + -1x = 15 Solving 21 + -1x = 15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -1x = 15 + -21 Combine like terms: 21 + -21 = 0 0 + -1x = 15 + -21 -1x = 15 + -21 Combine like terms: 15 + -21 = -6 -1x = -6 Divide each side by '-1'. x = 6 Simplifying x = 6
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