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4x-3y = -29
_________-
6y = 42
y = 42:6
y = 7
4x+3y = 13
4x+3(7) = 13
4x+21 = 13
4x = 13-21
4x = -8
x = -8:4
x= -2
jadi 2x+3y
2(-2)+3(7)
-4+21
17