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c+0.75+1.5c=12
We move all terms to the left:
c+0.75+1.5c-(12)=0
We add all the numbers together, and all the variables
2.5c-11.25=0
We move all terms containing c to the left, all other terms to the right
2.5c=11.25
c=11.25/2.5
c=4+1/2
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