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1.2(c-12)=78
We move all terms to the left:
1.2(c-12)-(78)=0
We multiply parentheses
1.2c-14.4-78=0
We add all the numbers together, and all the variables
1.2c-92.4=0
We move all terms containing c to the left, all other terms to the right
1.2c=92.4
c=92.4/1.2
c=77+1.4210854715202E-14/1.2
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