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L in (-oo:+oo)
2*L+2*(3/4)*L = 50 // - 50
2*L+2*(3/4)*L-50 = 0
7/2*L-50 = 0 // + 50
7/2*L = 50 // : 7/2
L = 50/7/2
L = 100/7
L = 100/7
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