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1/3x-y = -3
1/3(-1/2y+5)-y = -3
-1/6y + 5/3 = -3
dikalikan 6. menjadi ...
-y + 10 = -18
y = 18+10 = 28
x = -1/2y+5 = -1/2(28)+5 = -14+5 = -9