factoriser A
A=(125* $a^{3}$ +1)-(1+5*a) $^{2}$ -3-15*a
31+(180/2-46)*10/52
2000000 - (1000000 + 30000)
4b+b
-35x + 10
x^2-7x+28=0
2x+5x
d+d+d+d+d
2
