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1(66788865433+5c)-766=5555555666666666
We move all terms to the left:
1(66788865433+5c)-766-(5555555666666666)=0
We add all the numbers together, and all the variables
1(5c+66788865433)-766-5555555666666666=0
We add all the numbers together, and all the variables
1(5c+66788865433)-5555555666667432=0
We move all terms containing c to the left, all other terms to the right
1(5c+66788865433)=5555555666667432
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