Network analysis - anyone dare to do this

To all , who know how to solve the problems mathematically, something for you all.
Please solve it

Kirchoff's Current Law (KCL):
At every node, the sum of all currents entering a node must equal zero.
Kirchoff's Voltage Law (KVL):
The voltage law says that the sum of voltages around every closed loop in the circuit must equal zero.
Exercise :
Please apply Kirchoff's Current and Voltage laws to the following figures.
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