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x-y = 7
______-
2y = 4
y = 2
x+y = 11
x+2 = 11
x = 9
x+2y
9+4 = 13
x + y = 11
x - y = 7
jadinya
x = 9
y = 2
maka x +2y = 9 +2(2) = 13