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a+(-15.46)=2a
We move all terms to the left:
a+(-15.46)-(2a)=0
We add all the numbers together, and all the variables
-1a-15.46=0
We move all terms containing a to the left, all other terms to the right
-a=15.46
a=15.46/-1
a=-15+0.46/1
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