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a+a/2+a-4=21
We move all terms to the left:
a+a/2+a-4-(21)=0
We add all the numbers together, and all the variables
2a+a/2-25=0
We multiply all the terms by the denominator
2a*2+a-25*2=0
We add all the numbers together, and all the variables
a+2a*2-50=0
Wy multiply elements
a+4a-50=0
We add all the numbers together, and all the variables
5a-50=0
We move all terms containing a to the left, all other terms to the right
5a=50
a=50/5
a=10
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