Eid Special Puzzle, Try to solve

Answer of the whatsapp puzzle Eid Special Puzzle, Try to solve is : 786

HOW : For the simplification lets assume

🕋  = x
🛐  = y
☪ =  z

So the first equation is  y+ x + z = 21

Second equation is y*y -z*z = z+y

From the rule of algebra we can also write this equation as

= (y+z)*(y-z) = y+z
= y-z = 1
y = z+1

Now our third equation will become as x*x – y*y = y+x
similarly as per the rule of algebra we can write it as follows

= (x+y)*(x-y) = x+y
= x – y = 1
= x = y +1

Now overall we have these three equations

y+ x + z = 21
y = z+1
x = y +1

If we replace the values of last two equations in to first equation we will get

(z+1) + ((z+1)+1) + z = 21
3z + 3 = 21
3z = 18
z= 6

If the values of z is 6 than the value of y would be 7 (y+1), similarly value of x would be 8 (x+1)

So now we have

🕋  = x = 8
🛐  = y = 7
☪ =  z = 6

If we put these values in to the following equation then

🛐🕋*1⃣0⃣ +☪ = ❓
78*10 + 6 = 786