-25=1/3n - 10
move -10 to the other side
sign changes from -10 to +10
-25+10=1/3n-10+10
-25+10=1/3n
-15=1/3n
multiply both sides by 3/1 to get n by itself
(-15)(3/1)=1/3n(3/1)
cross out 3 and 3 and 1 and 1, divide by 3 and 1
then becomes 1*1*1*1*n=n
(-15)(3/1)==45/1=-45
answer:
n=-45
