<PRE><B>Question 614269</B>
how do you solve a problem that is 21 -Z divided by 3 = 5
assume the problem is
{{{((21-z))/3}}} = 5
Multiply both sides by 3, gets rid of the denominator
21 - z = 3(5)
21 - z = 15
Subtract 21 from both sides
-z = 15 - 21
-z = -6
z = +6
:
:
Check in the original problem
{{{((21-6))/3}}} = 5</PRE>