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5x - 2y = 21
--------------- +
4x = 12
x = 12/4
x = 3
5x - 2y = 21
5.3 - 2y = 21
15 - 2y = 21
-2y = 21 - 15
-2y = 6
y = 6/-2
y = -3
Maka, 2x - 3y = 2.3 - 3.(-3) = 6 + 9 = 15