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2014-11-19T16:47:37+02:00
20X=19-{3+12X]

20X=19-3-12X
20x+12x=16
32x=16
x=16:2
x=8


{13-X-5}-{9+6X}=-3X

13-X-5-9-6X=-3X
-1-7x=-3x
-7x+3x=1
-4x=1
x=-1/4

3{6-5X}=-17X-10
18-15X=-17X-10
17x+15=-10-18
32x=-28
x=-28/32
x=-7/8


3,8X-{1,6-1,2X}=9,6+{3,7-5X}

3,8X-1,6+1,2X=9,6+3,7-5X
5x-1,6=13,3-5x
5x+5x=13,3+1.6
10x=14,9
x=14,9:10
x=1,49


0,15X-0,6=9,9=0,3X-0,3
0,15x-0,3x=0,6-0,3
-0,15x=0.3
x=-0.3:0.15
x=-2