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Simplifying n + 90 = 2n + 70 Reorder the terms: 90 + n = 2n + 70 Reorder the terms: 90 + n = 70 + 2n Solving 90 + n = 70 + 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. 90 + n + -2n = 70 + 2n + -2n Combine like terms: n + -2n = -1n 90 + -1n = 70 + 2n + -2n Combine like terms: 2n + -2n = 0 90 + -1n = 70 + 0 90 + -1n = 70 Add '-90' to each side of the equation. 90 + -90 + -1n = 70 + -90 Combine like terms: 90 + -90 = 0 0 + -1n = 70 + -90 -1n = 70 + -90 Combine like terms: 70 + -90 = -20 -1n = -20 Divide each side by '-1'. n = 20 Simplifying n = 20
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