Answer:
5
Explanation:
(8x² - 15x) - (x² - 27x) = ax² + bx
<=> 8x² - 15x - x² + 27x = ax² + bx
<=> 8x² - x² - 15x + 27x = ax² + bx
<=> 7x² + 12x = ax² + bx
a = 7, b = 12
b - a = 12 - 7 = 5
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