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Painted Pots lets customers choose and paint their own pottery. The store has teapots in multiple sizes. Rebecca chose to paint the largest teapot offered, which cost $18\$$. She also painted $4$ small teacups to go with her teapot. Rebecca spent a total of $42\$$ on pottery.$\newline$Which equation can you use to find $c$, the cost of each teacup?$\newline$Choices:$\newline$(A) $18(c + 4) = 42$$\newline$(B) $4(c + 18) = 42$$\newline$(C) $18c + 4 = 42$$\newline$(D) $4c + 18 = 42$$\newline$What was the cost of each teacup?$\newline$$\_\_\_\$$