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2x+y=7 (2)
pers (2) dibuat y=7-2x
subtitusikan pers (2) ke pers (1)
3x-2(7-2x)=-7
3x-14+4x=-7
7x=7
x=1
subtitusi nilai x ke y=7-2x
y=5
Penyelesaian (p,q) = (1,5)
Ditanya 2p+q = 7