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= (5x+4) - [2(-2x+5)]
= (5x+4) - [-4x+10]
= 5x+4+4x-10
= 5x+4x+4-10
= 9x-6
q = -2x + 5 ⇒ 3x + 9 = 0
3x = -9
x = -9/3 = -3
p = 5 x -3 + 4 = -11
q = -2 x -3 = 4 = 10 ⇒ p - 2q = -11 - 2 x 10 = -11 - 20 = -31