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6/4 - 9/4x = -6 /*4
6-9x=-24
-9x=-24-6
-9x=-30
x=3⅓
3/2-9/4x= -6 /-3/2
-9/4x = -15/2 /:(-9/4)
x = 20/6
po skróceniu
x = 10/3 = 3 i 1/3
3(2-3x)=-24 |÷3
2-3x=-8
-3x=-10
x=10/3
x=3⅓