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-a+3/4=21/4
We move all terms to the left:
-a+3/4-(21/4)=0
We add all the numbers together, and all the variables
-a+3/4-(+21/4)=0
We add all the numbers together, and all the variables
-1a+3/4-(+21/4)=0
We get rid of parentheses
-1a+3/4-21/4=0
We multiply all the terms by the denominator
-1a*4+3-21=0
We add all the numbers together, and all the variables
-1a*4-18=0
Wy multiply elements
-4a-18=0
We move all terms containing a to the left, all other terms to the right
-4a=18
a=18/-4
a=-4+1/2
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