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-7.2(1.6-7a)-4.2a=103.98
We move all terms to the left:
-7.2(1.6-7a)-4.2a-(103.98)=0
We add all the numbers together, and all the variables
-7.2(-7a+1.6)-4.2a-(103.98)=0
We add all the numbers together, and all the variables
-4.2a-7.2(-7a+1.6)-103.98=0
We multiply parentheses
-4.2a+50.4a-11.52-103.98=0
We add all the numbers together, and all the variables
46.2a-115.5=0
We move all terms containing a to the left, all other terms to the right
46.2a=115.5
a=115.5/46.2
a=2+1/2
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