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x - 3y + 2 = 0
-3y = -x - 2 /:(-3)
y = 1/3 x + 2/3
b)
2y - 7 = 0
2y = 7 /:2
y = 3,5
c)
2x - 5 = 0
nie jest to możliwe (nie ma 'y')