It is known in mathematics that 3 / x equals 4 / y, 5 / m does not equal 0 Finding the value of X + y + m of X + y-m

It is known in mathematics that 3 / x equals 4 / y, 5 / m does not equal 0 Finding the value of X + y + m of X + y-m

x/3=y/4=m/5≠0
Let X / 3 = Y / 4 = m / 5 = t
There are: x = 3T, y = 4T, M = 5T
The required equations are as follows:
(x+y+m)/(x+y-m)=(3t+4t+5t)/(3t+4t-5t)=6