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12y-y-5=10-1
12y-y-10y=1+5
y=6
b) 2 (u-5) + 15 = 3(u-4) + 10
2u-10+15=3u-2+10
2u-3u=-12+10-10+15
-u=3 :(-1)
u=-3
12y-y-5=10y-1
11y-10y=5-1
y=4
b) 2 (u-5) + 15 = 3(u-4) + 10
2u-10+15=3u-12+10
2u-3u=10-15-12+10
-u=-7/(-1)
u=7