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x+y =10 ->disubstitusikan
jadi 6x = 36
x = 36/6
x = 6
x+y =10
6+y =10
y = 10-6
y = 4
jadi 2x+y = 2(6)+4
= 12 + 4
= 16
x + y =10+
6x =36
x =36
6
x =6
kemudian masukkan nilai x = 6 kepersamaan x + y = 10
x + y = 10
6 + y =10
y =10-6
y = 4
maka 2x + y = 2.6 + 4
= 12 + 4
= 16