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4x - 3y =15 l*2l 8x - 6y =30 +
29x =87
x =87/29
x =3
4x - 3y =15
4(3) -3y=15
12-3y=15
-3y=15-12
-3y=3
y=-1
3x-2y=3(3)-2(-1)=9+2=11 (d)