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1.8c=7.5
We move all terms to the left:
1.8c-(7.5)=0
We add all the numbers together, and all the variables
1.8c-7.5=0
We move all terms containing c to the left, all other terms to the right
1.8c=7.5
c=7.5/1.8
c=4+0.3/1.8
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