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1 - 4x = 8
-4x = 8 - 1
-4x = 7 //:(-4)
x = -7/4
sprawdzenie:
L = 1 - 3 * (-7/4) - (-7/4) = 1 + 21/4 + 7/4 = 4/4 + 21/4 + 7/4 = 32/4 = 8 = P