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11=26
6=18
18/6=2
beda =2
ke5. 8-2=6
ke4. 6-2=4
ke3. 4-2=2
ke2. 2-2=0
ke1. 0-2=-2
u11 = 26
u1=a
a + 4b = 8
a + 10b = 26
---------------- -
a + (-6b) = -18
b = 3
a+4b = 8
a + 4(3)=8
a + 12 = 8
a = -3
u1 = -3