How do you solve #z/2.8 = -6.2#?
Multiply both sides of the equation by
The truth of an equation is preserved by any of the following operations:
(1) Add or subtract the same value on both sides.
(2) Multiply or divide both sides by the same non-zero value.
Note that you can also do things like square both sides of an equation, but this can introduce spurious solutions: that is the new equation may have solutions that the old one does not.