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3y-5y=-1-15
-2y=-16
y=16/-2
y=8
b. (3a+18)/4=(10a-2)/3
(9a+54)/12=(40a-8)/12
dikali 12 menjadi
9a+54=40a-8
9a-40a=-8-54
-31a=-62
a=-62/-31
a=2
c. 1/2(3x-6)=2/3(2x-3)
3/2x-3=4/3x-2
3/2x-4/3x=-2+3
9/6x-8/6x=1
1/6x=1
x=1:1/6
x=6/6x6/1
x=36/6
x=6
d. 2+11/b=7 1/2
2+11/b=15/2
11/b=15/2-2
11/b=11/2
b=2