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Simplifying 90 = n + n + -4 Reorder the terms: 90 = -4 + n + n Combine like terms: n + n = 2n 90 = -4 + 2n Solving 90 = -4 + 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 + -2n = -4 + 2n + -2n Combine like terms: 2n + -2n = 0 90 + -2n = -4 + 0 90 + -2n = -4 Add '-90' to each side of the equation. 90 + -90 + -2n = -4 + -90 Combine like terms: 90 + -90 = 0 0 + -2n = -4 + -90 -2n = -4 + -90 Combine like terms: -4 + -90 = -94 -2n = -94 Divide each side by '-2'. n = 47 Simplifying n = 47
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