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3x+2y = 7 (x3) --> 9x+6y = 21 _
-x = 3
x = -3
3x+2y = 7
3(-3)+2y = 7
-9+2y = 7
2y = 7+9
2y = 16
y = 8
5x-3y = 5(-3)-3.8
= -15-24
= -39