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6/4x-12=18
6/4x=30 /*4
6x=120 /:6
x=20
b)
x/6-1/6=1 /*6
x-1=6
x=5
c)
24x-12=x/3 /*3
72x-36=x
72x-x=36
71x=36 /:71
x=36/71
d)
2/5(3-x)=-2
6/5-2/5x=-2
-2/5x=16/5 /*5
-2x=16 /:(-2)
x=-8
e)3/4(2 - 3x) = -6
6/4-9/4x=-6
-9/4x=-7,5 /*4
-9x=-30 /:(-9)
x= 3 i jedna trzecia
f) 1/5(x - 3) = 9 - x
1/5x-3/5=9-x
1/5x+x=9+3/5
6/5x=48/5 /*5
6x=48 /:6
x=8
Pozdrawiam:)