Preview question: $$ 2 \left( -8 x + 21 \right) = -2 \left( 10 x - 25 \right) $$

Behaviour being used: Adaptive mode

Minimum fraction: 0

Question summary: $$ 2 \left( -8 x + 21 \right) = -2 \left( 10 x - 25 \right) $$

Right answer summary: 2

Question state: todo