c is a pro-numeral
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2b + 2c or 2(b + c)
3 types of relations in algebra are to graph, table, and map the x,y ordered pairs. just learned this! C:
Any letter in the alphabet can be used to represent a variable in algebra.
Unless you're doing an algebra problem, that sounds right to me.
It's a variable, like a, b, c, 1, 2, 3