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Simplifying 21 + -2n = 7(n + -10) Reorder the terms: 21 + -2n = 7(-10 + n) 21 + -2n = (-10 * 7 + n * 7) 21 + -2n = (-70 + 7n) Solving 21 + -2n = -70 + 7n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-7n' to each side of the equation. 21 + -2n + -7n = -70 + 7n + -7n Combine like terms: -2n + -7n = -9n 21 + -9n = -70 + 7n + -7n Combine like terms: 7n + -7n = 0 21 + -9n = -70 + 0 21 + -9n = -70 Add '-21' to each side of the equation. 21 + -21 + -9n = -70 + -21 Combine like terms: 21 + -21 = 0 0 + -9n = -70 + -21 -9n = -70 + -21 Combine like terms: -70 + -21 = -91 -9n = -91 Divide each side by '-9'. n = 10.11111111 Simplifying n = 10.11111111
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