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-4=-9/7a
We move all terms to the left:
-4-(-9/7a)=0
Domain of the equation: 7a)!=0We get rid of parentheses
a!=0/1
a!=0
a∈R
9/7a-4=0
We multiply all the terms by the denominator
-4*7a+9=0
Wy multiply elements
-28a+9=0
We move all terms containing a to the left, all other terms to the right
-28a=-9
a=-9/-28
a=9/28
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