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1/2x+1/4y= 4 (kali 4) a-2b= x-2y
4x-3y= 12 a-2b=???
2x+y= 16 (kali 2)
4x-3y= 12
4x+2y= 32 (eliminasi)
-5y= -20
-y= -4
y= 4
4x- 3y= 12
4x- 3.4= 12
4x-12= 12
4x= 24
x= 6
a-2b
6-2.4
6-8
-2