Solve for c
c=13
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13=1.5\times 0+9\times 0+c
Zero divided by any non-zero number gives zero.
13=0+9\times 0+c
Multiply 1.5 and 0 to get 0.
13=0+0+c
Multiply 9 and 0 to get 0.
13=c
Add 0 and 0 to get 0.
c=13
Swap sides so that all variable terms are on the left hand side.
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