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Simplifying (r + 7) + -1n = r Reorder the terms: (7 + r) + -1n = r Remove parenthesis around (7 + r) 7 + r + -1n = r Reorder the terms: 7 + -1n + r = r Add '-1r' to each side of the equation. 7 + -1n + r + -1r = r + -1r Combine like terms: r + -1r = 0 7 + -1n + 0 = r + -1r 7 + -1n = r + -1r Combine like terms: r + -1r = 0 7 + -1n = 0 Solving 7 + -1n = 0 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 + -1n = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1n = 0 + -7 -1n = 0 + -7 Combine like terms: 0 + -7 = -7 -1n = -7 Divide each side by '-1'. n = 7 Simplifying n = 7
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