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15x+4y-10=0 ----> 15x+4y=10
5x+y=2 Ι kali 3 Ι 15x+3y=6
15x+4y=10 Ι kali 1 Ι 15x+4y=10
persamaan diatas dikurangi
maka -y = -4
y = 4
substitusi ke 5x+y=2
5x+4=2
5+4-2=x
x=7