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Simplifying 21 + -7n = 7 + -5n Solving 21 + -7n = 7 + -5n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '5n' to each side of the equation. 21 + -7n + 5n = 7 + -5n + 5n Combine like terms: -7n + 5n = -2n 21 + -2n = 7 + -5n + 5n Combine like terms: -5n + 5n = 0 21 + -2n = 7 + 0 21 + -2n = 7 Add '-21' to each side of the equation. 21 + -21 + -2n = 7 + -21 Combine like terms: 21 + -21 = 0 0 + -2n = 7 + -21 -2n = 7 + -21 Combine like terms: 7 + -21 = -14 -2n = -14 Divide each side by '-2'. n = 7 Simplifying n = 7
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