Circuit Analysis assignment

Use nodal analysis to find the voltage at each node of this circuit.

Implement your solution in MATLAB, allowing for changes to the given resistances.

You will be graded on the result provided to a given set of input values for $R.$

$R1=90$ ohms

$R2=30$ ohms

$R3=100$ohms

$R4=R5=20$ ohms

$R6=15$ ohms

$R7=60$ ohms

What is the answer for V$3=0?$