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-3
7(x-3) < -3x
7x - 21 < - 3x
7x + 3x < 21
10x < 21
x< 21/10 (ułamek)
x= 2 1/10 (ułamek)
7x-21 > -3x
-21 > -3x-7x
-21 > -10x
21/10 < x
x>21/10 (2 i 1/10 albo 2,1)