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mnożymy na krzyż
5b = 3b+36
2b=36
b = 18
b)x-8/x=3/4
4x-32=3x
x=32
c) x/432-x=4/5
5x = 1728-4x
9x = 1728
x = 192
x-2/x=2/3
3x-6 = 2x
x = 6