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-3x-3-x=9
-3x-x=9+3
-4x=12/:(-4)
x=-3
b)m/2=20/8
m=20*2/8
m=5
c) 1-9x/5-3=-5+3x/8
1-9x/2=-5+3x/8 /*8
1-9x/2*8=-5+3x
4-36x=-5+3x
4+5=3x+36x
9=39x
x=9/39
x=3/13
d) x+2/3=x/8
2+x/3=x/8
3x=8(2+x)
3x=16+8x
3x-8x=16
-5x=16 /:(-5)
x=16/-5
x=3⅕
e) 2(x+1)-x=-7
2x+2-x=-7
2x-x=-7-2
x=-9
f) 3/7=z/14
z=14*3/7
z=6