common.or
auth.dont_have_account auth.register
সরল কর :
(2p+5q)+3(2p+5q)2(59-2p)+3(2p+5q)(5q-2p)2+(59-2p)3
3x+y
x2+y
5p+2q
a2b+c2d
6p-7
ax-by
