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Simplifying 20 = -4(-7 + k) 20 = (-7 * -4 + k * -4) 20 = (28 + -4k) Solving 20 = 28 + -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. 20 + 4k = 28 + -4k + 4k Combine like terms: -4k + 4k = 0 20 + 4k = 28 + 0 20 + 4k = 28 Add '-20' to each side of the equation. 20 + -20 + 4k = 28 + -20 Combine like terms: 20 + -20 = 0 0 + 4k = 28 + -20 4k = 28 + -20 Combine like terms: 28 + -20 = 8 4k = 8 Divide each side by '4'. k = 2 Simplifying k = 2
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