3x[ 8+2x( 5xn +27:3)] = 168
3x[ 8+2x( 5xn +9)] = 168
8+10n +18 = 56
10n = 56-8-18
10n =30
n=3
1225: [( 13x p - 30 ) :3-10] = 7
( 13x p - 30 ) :3-10 =1225:7
( 13x p - 30 ) :3-10 =175
( 13x p - 30 ) :3 =175+10
( 13x p - 30 ) :3 =185
13x p - 30 =185x3
13x p =555+30
13x p =585
p=585:13
p=45
