>>10960161easy mode
if both those = p
then they equal each other
16 - 4/5Q = 1 + 2/10Q
now put Q on one side and constants on the other
-4/5Q - 2/10Q = -16 + 1
-8/10Q - 2/10Q = -15
-10/10Q = -15
-Q = -15
Q = 15
now plug Q into either original equation
P = 16 - (4/5)15
= 16 - 4 × 3
= 16 - 12
= 4
OR
P = 1 + (2/10)15
= 1 + (30/10)
= 1 + 3
= 4
