Solve for c
c=0.4
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4=3.6+c
Multiply 0.9 and 4 to get 3.6.
3.6+c=4
Swap sides so that all variable terms are on the left hand side.
c=4-3.6
Subtract 3.6 from both sides.
c=0.4
Subtract 3.6 from 4 to get 0.4.
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