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0,75x=12 /*1/0,75
x=16
II.
2x-4=8
2x=8+4
2x=12
x=6
III.
3(2x-1)=5x-9
6x-3=5x-9
6x-5x=-9+3
x=-6
IV.
-4(5x+2)=2-10x
-20x-8=2-10x
-8-2=-10x+20x
-10=10x /:10
x=-1
V.
6x+2=2(x-3)
6x+2=2x-6
6x-2x=-6-2
4x=-8 /:4
x=-2
VI.
-4(7-5x)=12
-28+20x=12
20x=12+28
20x=40 /:20
x=2
VII.
5x-3=7+4x
5x-4x=7+3
x=10
VIII.
2x-4(x-3)=2
2x-4x+12=2
-2x=2-12
-2x=-10 /:-2
x=5
Jakby coś nie jasne-pisz.