How do you solve the equation of mc2

I don't know if this helps, but E represents energy, M represents mass, and C represents the speed of light.

E represents the energy, which we measure in Joules. Joules is an SI measurement for energy and is measured as kilograms x meters squared per seconds squared [kg x m2/s2]. ...m represents the mass of the specified object. For this equation, we measure mass in Kilograms (or 1000 grams).c represents the speed of light. 

Hope This Helps :)

The answer to this question is c

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0

the value of x is equal to 0.