$|x-6|=-5x+9$

$\iff [\begin{array}{c}x-6=-5x+9\\ x-6=5x-9\end{array}$

$\iff [\begin{array}{c}x+5x=9+6\\ x-5x=-9+6\end{array}$

$\iff [\begin{array}{c}6x=15\\ -4x=-3\end{array}$

$\iff [\begin{array}{c}x=\frac{15}{6}=\frac{5}{2}\\ x=\frac{3}{4}\end{array}$

because -4 x a = -8, so a = -8 : -4 = 2

because 2 x b = 10, so b = 10 : 2 = 5

because -4 x 5 = -20, so c = -20

chúc bn thi tốt mình sắp thi rùi

grew