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substitusi ke pers. 4x -3y= -17
4x -3(-3-3x) =-17
4x +9 -3x =-17
x = 26
substitusi nilai x ke pers
4(26) -3y=-17
104 -3y = -17
-3y = 87
y= 29
jadi p + 2q = 26+2(29)
= 26+ 58
=84
menggunakan substitisi sempurna