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-0.18=a+7.2/10
We move all terms to the left:
-0.18-(a+7.2/10)=0
We add all the numbers together, and all the variables
-(+a+7.2/10)-0.18=0
We get rid of parentheses
-a-0.18-7.2/10=0
We multiply all the terms by the denominator
-a*10-7.2-(0.18)*10=0
We add all the numbers together, and all the variables
-a*10-9=0
Wy multiply elements
-10a-9=0
We move all terms containing a to the left, all other terms to the right
-10a=9
a=9/-10
a=-9/10
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