This does not sound like an equation. This sounds like evaluating an algebraic expression. 3C means 3 times the value of C (which you have given as 21) then subtract 15.
3 x 21 - 15 = 48
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The general equation of the line is y = 3x + c. Having only one coordinate (21) of a point on this line is not enough to evaluate c.
The equation is 21 x 100 = 2100 which is MMC in roman numerals.
It is an equation ... Anything with an equals is an equation 2+b=6 Anything without an equals is an expression 2+a
An equation where c = 5
p+c=r.