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x = pensil
y = spidol
x + y = 20
1000x + 1500 y = 22000
x + y = 20
10x + 15y = 220
10x + 10y = 200
10x + 15y = 220
_______________ -
-5y = -20
y = 4
x + y =20
x + 4 = 20
x = 16
jadi, ada 16 pensil dan 4 spidol.