How to solve this equation

How to solve this equation

X minus five parts of x equals 500
4X/5=500
X=500*5/4
X=625

A number minus the sum of 1 / 6 and 3 / 8, the difference is 3 / 4, what is the number? (use the equation solution.)

Let this number be X
x-(1/6+3/8)=3/4
x=1/6+3/8+1/4
x=19/24

Solving the equation: two thirds of x minus four equals six parts of x plus nineteen minus X,

2x/3-4=x/6+19-x
Move items and merge similar items
3x/2=23
x=46/3

20 plus 20 plus 3.14 times 2 times x equals 77.68. How to solve this equation?

20 plus 20 plus 3.14 times 2 times x equals 77.68
40+6.28x=77.68；
6.28x=37.68；
x=6；
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