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8x-2(12x-8)=7-x
8x-24x+16=7-x
-15x=7-16
-15=-9\:(-15)
x=9\15=3\5
3x-2(1-2x)=0,5(3x+1,5)
3x-2+4x=1,5x+0,75
7x-1,5x=0,75+2
5,5x=2,75\:5,5
x=0,5
3 1\3x+8=4 2\5x-8 \*15
15x+120=24x-120
15x-24x=120-120
-9x=0
x=0
d)x/2+x/4+x/5=x-1 \*20
10x+5x+4x=20x-20
19x-20x=-20
-x=-20
x=20