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7/4 = 5 - x
7/4 = 20/4 - x
-13/4 = -x
x = 3 1/4 (trzy i jedna czwarta)
-3=20-4x
-23=-4x/:(-4)
x=5 i 3/4
x + x - x = 5 + 5/4 - 1/2
x = 5 + 5/4 - 2/4
x= 5 3/4