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Simplifying 7 + -7n + 5n = 20 + -51 Combine like terms: -7n + 5n = -2n 7 + -2n = 20 + -51 Combine like terms: 20 + -51 = -31 7 + -2n = -31 Solving 7 + -2n = -31 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -2n = -31 + -7 Combine like terms: 7 + -7 = 0 0 + -2n = -31 + -7 -2n = -31 + -7 Combine like terms: -31 + -7 = -38 -2n = -38 Divide each side by '-2'. n = 19 Simplifying n = 19
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