How Can You Calculate the Total Equivalent Resistance in a Circuit?

[HEYJOHN]

What single, equivalent resistor could replace all of the resistors in this circuit?

Rtot = Ω
2 NO

HELP: If you study the diagram, you will see one pair of resistors which is in parallel. Replace this pair with a single equivalent resistor and re-draw the circuit.

HELP: If you have followed the previous suggestion, you will now see a pair of resistors which is in series. Replace this pair with a single equivalent resistor and re-draw the circuit again.

here is an image of the circuit: https://tycho-s.physics.wisc.edu/cgi/courses/shell/common/showme.pl?courses/phys104/fall09/homework/04/r2/ex1s95p3.gif

Req parallel: 1/R1 + 1/R2 = 1/Req

Req series: R1 + R2 =Req

R1=2 R2=5 R3=13 R4=8

I've tried to redraw the circuit where Req= R1 + R2 + [1/(1/R3)+(1/R4)] but that didn't work, any suggestions to which two resistors in the image are parallel to one another to get me started on redrawing the circuit to solve the problem?

 

[HEYJOHN]

Just figured it out, thanks!