Question

Scrieti multimea solutiilor ecuatiei :
A)2x+3=x+8
B)2x+3=2 (x+1)
C)3 (x+1)=3 (x+2)-3

Answer 1

A)2x+3=x+8
2x-x=8-3
x=5
B)2x+3=2 (x+1)
2x+3=2x+2
2x-2x=2-3
0=-1
x∈Ф
C)3 (x+1)=3 (x+2)-3
3x+3=3x+6-3
3x-3x=3-3
x∈Ф