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Simplifying 21 + -1N = 87 + 2N Solving 21 + -1N = 87 + 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 + -1N + -2N = 87 + 2N + -2N Combine like terms: -1N + -2N = -3N 21 + -3N = 87 + 2N + -2N Combine like terms: 2N + -2N = 0 21 + -3N = 87 + 0 21 + -3N = 87 Add '-21' to each side of the equation. 21 + -21 + -3N = 87 + -21 Combine like terms: 21 + -21 = 0 0 + -3N = 87 + -21 -3N = 87 + -21 Combine like terms: 87 + -21 = 66 -3N = 66 Divide each side by '-3'. N = -22 Simplifying N = -22
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