The equations I obtained are:

i2=i1+i2

i3=i4+i5

i5=i7-i6

i2=i4+i6

3i2-i1R1-i5R2=0

2v-i2R3=0

-i6R4+2v-i5R2=0

Could someone help me understand step by step what procedures to perform to get to the solution.

I thank you all anyway and have a good evening, see you soon!