It would be

it would be 15 because you subtract 19 from both sides and the 19's cancel so your answer would be
i need more info then triangle abc,m find m
X - 25 = 1/3x + 105
x - 1/3x = 105 + 25
2/3x = 130
x = 130 * 3/2
x = 390/2
x = 195 <==== previous weight
Irrational numbers are numbers that cannot be expressed in fractions
The answer to this is 4/3