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y=5x-8............1
substitusi pers 1 ke 2
2x+3y=27 .......2
2x+3(5x-8)=27
2x+15x-24=27
17x=51
x=3.........................................p
substitusi x ke pers 1
y=5x-8
y=5(3)-8
=7.........................................q
2p-q
2(3)-7
-1