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11y-10y=4
y=4
b)2u-10+15=3u-12+10
2u-3u=-2+10-15
-u=-7/:(-1)
u=7
c)-3y-3-2=4-y
d)6q-4-6=9a-4,5+1
y=4
b)2u-10+15=3u-12+10
-u=-7/:-1
u=7
c)-3y-3-2=4-y
-2y=9
y=-4,5
d)6a-4-6=9a-4,5+½
15a=6/: 15
a=2/5