Va rog repede daca se poate ! Dau coroana

A
rad 7 x +1= ras 7 +1 => x=1
B
2/5x=2,4 => 0.4x=2.4
x=6
C
anulam 1 in fiecare parte
rad7x=rad8=> x= rad8/rad7 (rationalizam)
rad56/7= 2rad14/7
D
aducem la același numitor
(3rad3x-3)/3rad3 =0 =>
3rad3x=0 => x=0