Re2= (Re1*R7)/Re1+R7
Re2= (557000*2000)/(557000+2000)
Re2= 19306.7

Re3= Re2+R2
Re3= 19306.7+120
Re2= 19426.7

Re4= (R3*R4)/(R3+R4)
Re4= (30000*3300)/(30000+3300)
Re4= 2972.97

Re5= R1+Re4+Re3
Re5= 220+2972.97+19426.7
Re5= 22619.67

V=I*R
I = 5V/22619.67
I = 2.21*10^-4

5V = I*R1+I*Re4+I*Re3
5V = 2.21*10^-4(220)+ 2.21*10^-4(2972.97)+ 2.21*10^-4(19426.7)
5V = 5V

ECUACIONES DE LEYES DE KIRCHOFF

5V = I*R1+(I2*I3)+Re4+(I*Re3)
5V = I*R1+(I2*I3)+Re3+(I*R2)+I*Re2
5V = I*R1+(I2*I3)+Re3+(I*R2)+(I5*I6)+Re1
5V = I*R1+(I2*I3)+Re3+(I*R2)+(I5*R7)+(I6*R6+I6*R7)