Before moving a microscope, changing slides, or putting it away you must always . This prevents damage to the scope.

You must always use two hands.

Explanation:

Using two hands provides more stability when carrying the microscope. So that would lower the chances of damaging the scope. Yw >:)

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)