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-9/5a=18
We move all terms to the left:
-9/5a-(18)=0
Domain of the equation: 5a!=0We multiply all the terms by the denominator
a!=0/5
a!=0
a∈R
-18*5a-9=0
Wy multiply elements
-90a-9=0
We move all terms containing a to the left, all other terms to the right
-90a=9
a=9/-90
a=-1/10
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