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Simplifying 6 + -1x + 7 = 21 Reorder the terms: 6 + 7 + -1x = 21 Combine like terms: 6 + 7 = 13 13 + -1x = 21 Solving 13 + -1x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + -1x = 21 + -13 Combine like terms: 13 + -13 = 0 0 + -1x = 21 + -13 -1x = 21 + -13 Combine like terms: 21 + -13 = 8 -1x = 8 Divide each side by '-1'. x = -8 Simplifying x = -8
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