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3-x-2x-1=0
2-3x=0
-3x=-2 //:(-3)
x=2/3
b) 3x + 4 = x + 5
3x-x-5+4=0
2x-1=0
2x=1
x=1/2
c) x + 2x = -6
x+2x+6=0
3x+6=0
3x=-6 //:3
x=-2
d) x + 4 = 2x - 1
x-2x+1+4=0
5-x=0
-x=-5
x=5
e) 3x - 4 - 1/2x = 6
5/2x-10=0
5/2=10
x=4
f)1/2x+3=-1 1/2
1/2x=-4 1/2
1/2x=-9/2 //:1/2
x=-9