Răspuns:
a) (9 x 9 - 6x6 - a) + (13 +28:4) = 5 x 10+ 3;
(81-36-q)+(13+7)=50+3
(45-a)+20=53
(45-a)=53-20
45-a=33
a=45-33
a=12
(99-b-3x 8) + 2 * 6:2 = 8 x 2 + 5 x 10
(99-b-24)+12:2=16+50
(99-b-24)+6=66
(99-b-24)=66-6
99-b-24=60
99-b=60+24
99-b=84
b=99-84
b=15
(6 x 4:3+ c): 7 = 16:4;
(24:3+c):7=4
(8+c)=4x7
8+c=28
c=28-8
c=20
(9 x 4:6 xd)-5 * 5 = 45:9
(36:6xd)-25=5
(6xd)=5+25
6xd=30
d=30:6
d=5
(e-5x6+ 10 5):5+4 x 8 = 42
(e-30+?????