Question

(99-b-3×8)+2×6:2=8×2+5×10

Answer 1

(99-b-3•8)+2•6:2 = 8•2+5•10
(99-b-24)+2•3 = 16+50
99-b-24+6 = 66
99-b-18 = 66
81-b = 66
-b = 66-81
-b = -15 /•(-1)
b = 15.

I hope I helped you :)

Answer 2

(99-b-24)+6=16+50
(99-b-24)+6=66
99-b-24=60
99-b=60+24
99-b=84
b=99-84
b=15