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Cost of paintings is 2x + 12 for any number of x paintings. This weekend the paintings would be half the price. This is shown below;
[tex]\begin{gathered} C=2x+12 \\ \frac{C}{2}=2(x+6) \\ \text{Half the price is also equal to 2x+12 divided by 2} \\ \text{Which is why 2 has b}een\text{ taken as a common factor} \\ \text{leaving us with x + 6} \end{gathered}[/tex]The cost of painting this weekend therefore is x+6