equations
if 2x=4
what is "x"?
what is 2
what is the number for pie
what is 3.14
what is 2x
what is a equations
if 7x-4+5=50
what is 7?
what is the circumference of this circle in the diameters are 7cm
what is 21.98cm
if you say 21.98 is wrong
7x+1/22=21
what is 21???????