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x - y = 3 -
2y = 8
y = 4 (nilai y)
x + y = 11
x + 4 = 11
x = 7
hasil kali = x dikali y = 7 x 4 = 28
bilangan 2 = b
a + b = 11
a - b = 3 -
2b = 8
b = 4
maka cari nilai a
a - b = 3
a - 4 = 3
a = 3 + 4
a = 7
maka
a x b = 7 x 4 = 28