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2x - y = -3 3x = 6x - 3y = -9
-2x = 10
x = -5
4x - 3y = 1
4( -5 ) - 3y = 1
-20 - 3y = 1
3y = 1 + 20
3y = 21
y = 7
nilai 3x - 2y
3( -5 ) - 2( 7 )
-15 - 14 = -29