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2y/4-y4=3
y/4=3
y=3·4
y=12
b)x/4+x/3+5=x
3x/12+4x/12+5=x
7x/12+5=x
7x/12-x=-5
7x/12-12x/12=-5
-5x/12=-5
-5x=-5·12
-5x=-60
x=12
c)x/5-x/2=0,6
2x/10-5x/10=0,6
-3x/10=0,6
-3x=6
x=-2
d)2x/5-1/3=x/3-2/5
6x/15-5/15=5x/15-6/15
6x/15-5x/15=-6/15+5/15
x/15=-1/15
15x=-15
x=-1
e)2x/3-1/3=3x/5
2x/3-3x/5=1/3
10x/15-9x/15=1/3
x/15=1/3
3x=15
x=5
f)x/3+x2+2=5
2x/6+3x/6=5-2
5x/6=35x=16
x=18/5
x=3 3/5