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0=-6x-1
6x=-1/6
x=-1/6
b) 0=(x-1) -(3x-5)
0=3x²+5
3x²=5/3
x²=5/3 /:1
x=5/3
e) 0,5(2-4x)=3-x
1-2x=3-x
-2x+x=3-1
-x=2/-1
x=-2
f) 2(u-5)+15=3(u-4)+10
2u-10+15=3u-12+10
2u-3u=10-15-12+10
-u=-7/-1
u=7