2 answers:
So I guess we are solving for x here :)
So here is my work...
a=2x+6xz
Basically I think it would be
a=6xz+2x
WAIT WAIT NO I'M WRONG FORGIVE ME!
It's x=a/2(1+3z)
Answer:

Step-by-step explanation:
given,
a = 2 x + 6 x z ..........................................(1)
to find the value of x take common from Left hand side of Equation (1)
taking common x
a = ( 2 + 6 z ) x ..........................................(2)
dividing both side by ( 2 + 6 z ) in equation (2) we get

hence, the answer is 
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