Svpp aider moi URGENT POUR DEMAIN !

a) (7÷9)y + 5 = 8
(7÷9)y = 8 − 5
(7÷9)y = 3
y = 3 ÷(7÷9)
y = 3 × (9÷7)
y = 27÷7

b) (1÷10)x − 2 = (5÷8)
(1÷10)x = (5÷8) + 2
(1÷10)x = (5÷8) + (16÷8)
(1÷10)x = (21÷8)
x = (21÷8) ÷ (1÷10)
x = (21÷8) × 10
x = 105÷4


c) (1÷4)x − (3÷8) = (2÷3)
(1÷4)x = (2÷3) + (3÷8)
(1÷4)x = (25÷24)
x = (25÷24) ÷ (1÷4)
x = (25÷24) × 4
x = 25÷6

d) (3÷7)y − (5÷35) = (−8÷14)
(3÷7)y = (−8÷14) + (5÷35)
(3÷7)y = (−3÷7)
y = (−3÷7) ÷ (3÷7)
y = (−3÷7) × (7÷3)
y = − 1