Solution of cubic linear equations: X / 3 = Y / 4 = Z / 5,7x + 3y-5x = 16 solution! Request process! Help! The understanding of words is: 3 / x = 4 / y = 5 / Z (1) 7x + 3Y minus 5x = 16 (formula 2)

Solution of cubic linear equations: X / 3 = Y / 4 = Z / 5,7x + 3y-5x = 16 solution! Request process! Help! The understanding of words is: 3 / x = 4 / y = 5 / Z (1) 7x + 3Y minus 5x = 16 (formula 2)

（1）x/3=y/4
(1) X / 3-y / 4 = 0
（1）4x-3y=0
（2）x/3=z/5
(2) X / 3-z / 5 = 0 (general)
（2）5x-3z=0
（3）7x+3y-5x=16
（3）2x+3y=16
The above three forms are formed as follows:
（1）4x-3y=0
（2）5x-3z=0
(3) 2X + 3Y = 16 (1) (3)
6x=16
X = 16 / 6 = 8 / 3 to (1)
3y=4*8/3=32/3
y=32/3×1/3=32/9
Substituting x = 8 / 3 into (2)
3z=5*8/3=40/3
z=40/3*1/3=40/9
Substitute x, y, Z into the original equation respectively
（1）8/3/3-32/9/4=8/9-8/9=0
（2）5*8/3-3*40/9=40/3-40/3=0
（3）2*8/3+3*32/9=16/3+32/3=48/3=16

It is known that 10Y = 7.5x, please ask 10y-7x = y + 3.14, what is X-Y

y=0.75x 7.5x-7x=0.75x+3.14 5x=7.5x＋31.4 -2.5x=31.4 10 y-2.5x=31.4+10y ...

5x-2-6=7x-3

7x-5x=3-2-6
2x=-5
x=5/2