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12y-y-5=10y-1
12y-y-10y=-1+5
y=4
b) 2(u-5)+15=3(u-4)+10
2u-10+15=3u-12+10
2u-3u=-12+10+10-15
-u=-7 /;(-1)
u=7
c) -3(y/3+1)-2=4(1-y)
-y-3-2=4-4y
-y+4y=4+3+2
3y=9 /:3
y=3
d) 2(3a-2)-6=4,5(2a-1)+1/2
6a-4-6=9a-4,5+0,5
6a-9a=-4,5+0,5+4+6
-3a=6 /:(-3)
a=-2
12y-y-5=10y-1
12y-y-10y=-1+5
y=4
-3(y/3+1) -2= 4(1-y)
-y-3-2=4-4y
-y+4y=4+5
3y=9/:3
y=3
2(u-5) +15=3(u-4)+10
2u-10+15=3u-12+10
2u-3u=-2+10-15
-u= -7/:(-1)
u=7
2(3a-2)-6=4,5 (2a-1) +1/2
6a-4-6=9a-4,5+0,5
6a-9a= -4+10
-3a= 6/:(-3)
a=-2