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2x - 8y =-20 |x2
4x + 3y = 17
4x - 16y = -40
---------------------- -
19 y = 57
y = 57/19
y = 3
4x + 3.3 = 17
4x + 9 = 17
4x = 17 - 9
4x = 8
x = 8/4
x = 2
x + y =
2 + 3 = 5
jadi nilai x + y = 5