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12.00+0.12a=58
We move all terms to the left:
12.00+0.12a-(58)=0
We add all the numbers together, and all the variables
0.12a-46=0
We move all terms containing a to the left, all other terms to the right
0.12a=46
a=46/0.12
a=383+0.039999999999999/0.12
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