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28 bagi 7 sama dengan 4
4 kali 4 sama dengan 16
4 kali 3 sama dengam 12
16=12
x= 3/4y
x + y= 28
3/4y + y= 28
4(3/4y + y)= 4(28)
3y + 4y= 112
7y= 112
y= 112/7
y= 16
x= 3/4y
x= 3/4(16)
x= 3(4)
x= 12
Jadi :
x= 12
y= 16