The given equation is 21.3 = x + 5.1.
To solve for x, we subtract 5.1 from both sides of the equation. This gives us: 21.3 - 5.1 = x.
Subtracting 5.1 from 21.3 gives us 16.2. So, the solution to the equation is x = 16.2.
So, if you plug 16.2 back into the equation, you’ll find that it holds true. 21.3 does indeed equal 16.2 + 5.1.