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5x + y = 7 | x 3 | ⇒ 15x + 3y = 21 -
-13y = 39
y = -3
3x - 2y = 12
3x + 6 = 12
3x = 6
x = 2
( 2 , -3 )
4p + 3q =
8 - 9 =