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Simplifying 3L + 3(L + -7) = 129 Reorder the terms: 3L + 3(-7 + L) = 129 3L + (-7 * 3 + L * 3) = 129 3L + (-21 + 3L) = 129 Reorder the terms: -21 + 3L + 3L = 129 Combine like terms: 3L + 3L = 6L -21 + 6L = 129 Solving -21 + 6L = 129 Solving for variable 'L'. Move all terms containing L to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 6L = 129 + 21 Combine like terms: -21 + 21 = 0 0 + 6L = 129 + 21 6L = 129 + 21 Combine like terms: 129 + 21 = 150 6L = 150 Divide each side by '6'. L = 25 Simplifying L = 25
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