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Simplifying n + -21 = 2n + -40 Reorder the terms: -21 + n = 2n + -40 Reorder the terms: -21 + n = -40 + 2n Solving -21 + n = -40 + 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 = -40 + 2n + -2n Combine like terms: n + -2n = -1n -21 + -1n = -40 + 2n + -2n Combine like terms: 2n + -2n = 0 -21 + -1n = -40 + 0 -21 + -1n = -40 Add '21' to each side of the equation. -21 + 21 + -1n = -40 + 21 Combine like terms: -21 + 21 = 0 0 + -1n = -40 + 21 -1n = -40 + 21 Combine like terms: -40 + 21 = -19 -1n = -19 Divide each side by '-1'. n = 19 Simplifying n = 19
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