Răspuns:
Explicație pas cu pas:
[(3x+4)•2+5]•3+5=270
[(3x+4)•2+5]•3=270-5
[(3x+4)•2+5]•3=265
(3x+4)•2+5=265:3
(3x+4)•2+5=88,3
(3x+4)•2=88,3-5
(3x+4)•2=83,3
3x+4=83,3:2
3x+4=41,67
3x=41,67-4
3x=37,67
x=37,67:3
x=12,56
