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5x + y = 7 | x2|
-----------------------
3x - 2y = 12
10x + 2y = 14
--------------------- (+)
13x = 26
x = 2 = p
3x - 2y = 12
3(2) - 2y = 12
6 - 2y = 12
2y = -6
y = -3 = q
4p + 3q = 4(2) + 3(-3)
= 8 - 9
= -1