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Simplifying 21 = 4k + -7 Reorder the terms: 21 = -7 + 4k Solving 21 = -7 + 4k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-4k' to each side of the equation. 21 + -4k = -7 + 4k + -4k Combine like terms: 4k + -4k = 0 21 + -4k = -7 + 0 21 + -4k = -7 Add '-21' to each side of the equation. 21 + -21 + -4k = -7 + -21 Combine like terms: 21 + -21 = 0 0 + -4k = -7 + -21 -4k = -7 + -21 Combine like terms: -7 + -21 = -28 -4k = -28 Divide each side by '-4'. k = 7 Simplifying k = 7
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