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Simplifying 72 = l + (l + -4) Reorder the terms: 72 = l + (-4 + l) Remove parenthesis around (-4 + l) 72 = l + -4 + l Reorder the terms: 72 = -4 + l + l Combine like terms: l + l = 2l 72 = -4 + 2l Solving 72 = -4 + 2l Solving for variable 'l'. Move all terms containing l to the left, all other terms to the right. Add '-2l' to each side of the equation. 72 + -2l = -4 + 2l + -2l Combine like terms: 2l + -2l = 0 72 + -2l = -4 + 0 72 + -2l = -4 Add '-72' to each side of the equation. 72 + -72 + -2l = -4 + -72 Combine like terms: 72 + -72 = 0 0 + -2l = -4 + -72 -2l = -4 + -72 Combine like terms: -4 + -72 = -76 -2l = -76 Divide each side by '-2'. l = 38 Simplifying l = 38
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