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Simplifying N + -21 = (-1N) + (-1N) Reorder the terms: -21 + N = (-1N) + (-1N) Combine like terms: (-1N) + (-1N) = -2N -21 + N = -2N Solving -21 + N = -2N Solving for variable 'N'. Move all terms containing N to the left, all other terms to the right. Add '2N' to each side of the equation. -21 + N + 2N = -2N + 2N Combine like terms: N + 2N = 3N -21 + 3N = -2N + 2N Combine like terms: -2N + 2N = 0 -21 + 3N = 0 Add '21' to each side of the equation. -21 + 21 + 3N = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 3N = 0 + 21 3N = 0 + 21 Combine like terms: 0 + 21 = 21 3N = 21 Divide each side by '3'. N = 7 Simplifying N = 7
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