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2p + 3q - 12 =0 -> 2p + 3q = 12
4p - 7q + 2 = 0 -> 4p - 7q = -2
2p + 3q = 12 (×) 2 -> 4p + 6q = 24
4p - 7q = -2 (×) 1 -> 4p - 7q = -2
4p + 6q = 24
4p - 7q = -2
---------(-)
13q = 26
q = 26/13
q = 2
masukan nilai q kedalam salah satu persamaan awal diatas untuk mencari nilai p( 4p - 7q = -2)
4p - 7q = -2
4p - 7(2) = -2
4p -14 = -2
4p = -2 + 14
4p = 12
p = 12/4
p = 3
jadi untuk hasil dari p + q adlh : 3 + 2 = 5