Răspuns :
faci inmultirea in paranteze
(15x-5-3)*4=28
(15x-8 )*4 =28
60x -32=28
60x=28+32
x=60/60
x=1
verificare : [5*(3*1-1)-3 ]*4=(5*2-3)*4=7*4=28
(15x-5-3)*4=28
(15x-8 )*4 =28
60x -32=28
60x=28+32
x=60/60
x=1
verificare : [5*(3*1-1)-3 ]*4=(5*2-3)*4=7*4=28
[5(3x-1)-3]=28/4
5(3x-1)-3 = 7
15x - 5 = 7+3
15x - 5 = 10
15x = 10+5
15x = 15
x = 15 / 15
x = 1
5(3x-1)-3 = 7
15x - 5 = 7+3
15x - 5 = 10
15x = 10+5
15x = 15
x = 15 / 15
x = 1