Question 635402
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Hi,
Note:  Goal is to <u>isolate the variable</u> on one side of the Equation
That gives a plan of action!
3z+5+2z=12+3z   |Subtracting 3z from both sides
   5+2z = 12    |Subtracting 5 from both sides
     2z = 7 
      z = 7/2  0r {{{3&1/2}}}  0r 3.5