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Simplifying 90 + 3n = 66 + 7n Solving 90 + 3n = 66 + 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. 90 + 3n + -7n = 66 + 7n + -7n Combine like terms: 3n + -7n = -4n 90 + -4n = 66 + 7n + -7n Combine like terms: 7n + -7n = 0 90 + -4n = 66 + 0 90 + -4n = 66 Add '-90' to each side of the equation. 90 + -90 + -4n = 66 + -90 Combine like terms: 90 + -90 = 0 0 + -4n = 66 + -90 -4n = 66 + -90 Combine like terms: 66 + -90 = -24 -4n = -24 Divide each side by '-4'. n = 6 Simplifying n = 6
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