## Algebra 1: Common Core (15th Edition)

The expression for pristine printing cards is $15+0.10x$. The expression for printing place cards is $10+0.15x$. Set the expressions equal to each other: $15+0.1x=10+0.15x$ (subtract 0.1 from both sides) $15=10+0.05x$ (subtract 10 from from both sides) $5=0.05x$ (divide both sides by 0.05 to isolate the variables) $\frac{5}{0.05}=x$ (divide) $x=100$