book Maths Puzzle Numerical Ability

How do i solve this equation?

3(4c+7)=12c

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book Other Question

For the following piecewise defined function find f(0)

f(x)={x^2+1,.....x<0
{x-1,.......x>0

Help, please... i have a pentadecogram with a perimeter of 200 inches what is the diameter