a) 2x=3x-1
2x-3x=-1
-1x=-1 |:1
x=1
b) 5x+1=4x
5x-4x=-1
x=-1
c)-2x+5x=-1/2-3/5
3x=-3/5-1/2
3x=-11/10 |:#
x= -11/30
d)2x-2x=2/3-1
0=-1/3
e)25/100x-2/1x=5/2+1/3
25/100x-2/1x=15/6+2/6
2x-1x=17/6
x=2 5/6
f)3x+90=12
3x=12-90
3x=78 |:3
x=26
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a) 2x=3x-1
2x-3x=-1
-1x=-1 |:1
x=1
b) 5x+1=4x
5x-4x=-1
x=-1
c)-2x+5x=-1/2-3/5
3x=-3/5-1/2
3x=-11/10 |:#
x= -11/30
d)2x-2x=2/3-1
0=-1/3
e)25/100x-2/1x=5/2+1/3
25/100x-2/1x=15/6+2/6
2x-1x=17/6
x=2 5/6
f)3x+90=12
3x=12-90
3x=78 |:3
x=26