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Simplifying 3 + -5(-7k + 3) = 128 Reorder the terms: 3 + -5(3 + -7k) = 128 3 + (3 * -5 + -7k * -5) = 128 3 + (-15 + 35k) = 128 Combine like terms: 3 + -15 = -12 -12 + 35k = 128 Solving -12 + 35k = 128 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 35k = 128 + 12 Combine like terms: -12 + 12 = 0 0 + 35k = 128 + 12 35k = 128 + 12 Combine like terms: 128 + 12 = 140 35k = 140 Divide each side by '35'. k = 4 Simplifying k = 4
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