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Simplifying 643 = 4 * 160 + n Multiply 4 * 160 643 = 640 + n Solving 643 = 640 + 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. 643 + -1n = 640 + n + -1n Combine like terms: n + -1n = 0 643 + -1n = 640 + 0 643 + -1n = 640 Add '-643' to each side of the equation. 643 + -643 + -1n = 640 + -643 Combine like terms: 643 + -643 = 0 0 + -1n = 640 + -643 -1n = 640 + -643 Combine like terms: 640 + -643 = -3 -1n = -3 Divide each side by '-1'. n = 3 Simplifying n = 3
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