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Simplifying (3k) + (k + 10) = 90 Reorder the terms: (3k) + (10 + k) = 90 Remove parenthesis around (10 + k) (3k) + 10 + k = 90 Reorder the terms: 10 + (3k) + k = 90 Combine like terms: (3k) + k = 4k 10 + 4k = 90 Solving 10 + 4k = 90 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + 4k = 90 + -10 Combine like terms: 10 + -10 = 0 0 + 4k = 90 + -10 4k = 90 + -10 Combine like terms: 90 + -10 = 80 4k = 80 Divide each side by '4'. k = 20 Simplifying k = 20
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