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90/a=6
We move all terms to the left:
90/a-(6)=0
Domain of the equation: a!=0We multiply all the terms by the denominator
a∈R
-6*a+90=0
We add all the numbers together, and all the variables
-6a+90=0
We move all terms containing a to the left, all other terms to the right
-6a=-90
a=-90/-6
a=+15
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