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Simplifying 7(3 + x) + (5 + -4x) = n (3 * 7 + x * 7) + (5 + -4x) = n (21 + 7x) + (5 + -4x) = n Remove parenthesis around (5 + -4x) 21 + 7x + 5 + -4x = n Reorder the terms: 21 + 5 + 7x + -4x = n Combine like terms: 21 + 5 = 26 26 + 7x + -4x = n Combine like terms: 7x + -4x = 3x 26 + 3x = n Solving 26 + 3x = n Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-26' to each side of the equation. 26 + -26 + 3x = -26 + n Combine like terms: 26 + -26 = 0 0 + 3x = -26 + n 3x = -26 + n Divide each side by '3'. x = -8.666666667 + 0.3333333333n Simplifying x = -8.666666667 + 0.3333333333n
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