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2x+y = 15000 |x3| => dikali
(eliminasi)
7x+3y = 50000
6x+3y = 45000
{di kurang}
x = 5000
(substitusi)
2x+y = 15000
2(5000)+y = 15000
10000+y = 15000
y = 15000-10000
y = 5000
jadi, nilai x= 5000 dan nilai y= 5000