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1/3x-1/2y =-4
--------) ruas bwh dikali 12
4x+6y =72
4x-6y =-48-
12y =120
y =10
nilai y disubtitusikan
4x+6y =72
4x+6.10 =72
4x+60 =72
4x =12
x =3
p+q = 3+10
= 13