4p+25=6 (p-3) - 3 (4-3p)

P = 5 ...

this is how=

first you expand the second equation

25 + 4p = - 18 + - 12 + 6p + 9p

then you add the like terms in the second equation:

25 + 4p = - 30 + 15p

then this is how=

25+30 = 15p - 4p

55=11p

p = 5