Find the potential at point A

Explanation

Let potential at A=x, applying Kirchhoff current law at junction A
`(x-20-10)/1+(x-15-20)/2+(x+30)/1=0`
`(2x-60+x-35+x+45+2x+60)/2=0`
`rArr6x+10=0rArrx=-5//3`
`"Potential at A"=-5/3V`