Vă rooog ! Pe toate 3 ! Urgentt!

Răspuns:
a)2x+1=1003
2x=1003-1
2x=1002
x=501
Verificare: 2×501+1=1003
1002+1=1003(A)
b)(y-430)×30=210
(y-430)=210:30
(y-430)=7
y=7+430
y=437
c)(777-z)-125=3130
777-z=3130+125
777-z=3255
z=777-3255
z= -2478
Răspuns:
a)2x+1=1003
2x=1003-1
2x=1002
x=1002:2
x=501
Verificare: 2×501+1=1003
1002+1=1003(A)
b)(y-430)×30=210
(y-430)=210:30
(y-430)=7
y=7+430
y=437
c)(777-z)-125=3130
(777-z)=3130+125
(777-z)=3255
z=777-3255
z= -2478