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Simplifying 640 = 4 * 130 + n Multiply 4 * 130 640 = 520 + n Solving 640 = 520 + n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1n' to each side of the equation. 640 + -1n = 520 + n + -1n Combine like terms: n + -1n = 0 640 + -1n = 520 + 0 640 + -1n = 520 Add '-640' to each side of the equation. 640 + -640 + -1n = 520 + -640 Combine like terms: 640 + -640 = 0 0 + -1n = 520 + -640 -1n = 520 + -640 Combine like terms: 520 + -640 = -120 -1n = -120 Divide each side by '-1'. n = 120 Simplifying n = 120
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