(JavaScript) Pick a random equation with random numbers

Ok, so I want these equations to be randomly picked: Equation 1: 4 x 3 + {4 x [(5 x 6) - 4] + 5} = x

Equation 2:
654 x 345 = y

Equation 3:
34s x 45 = z
s = 9

Equation 4:
4 + {45 x [34 + (5 x 7) + 7] + 67} = x

Equation 5:
x = 3e + 1l x 2 + 4a
e = 4,
l = 5,
a = 6

Equation 6:
e = [7 x 6z] + {3 - 4} + (3 + 4)
z = 4

Equation 7:
e = p x 73 / 21 - 34 + 15

With every number being a random number. So far I have some code but it won't work. Any help? P.S. I just want solid code answers. I need this TONIGHT. Please share to anyone who you think can help.