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20/4(2+3)=a
We move all terms to the left:
20/4(2+3)-(a)=0
We add all the numbers together, and all the variables
-a+20/45=0
We add all the numbers together, and all the variables
-1a+20/45=0
We multiply all the terms by the denominator
-1a*45+20=0
Wy multiply elements
-45a+20=0
We move all terms containing a to the left, all other terms to the right
-45a=-20
a=-20/-45
a=4/9
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