Question 286063
Pets First's total charge (C) for x walks is:
{{{10+3x}}}
Doggy Day Care's toatal charge (C) for x walks is:
{{{5+2x}}}
If you set these two equal to each other, you will find your answer:
{{{10+3x = 5+2x}}} Solve for x: Subtract 2x from both sides.
{{{10+x = 5}}} Subtract 10 from both sides.
{{{x = -5}}}
Now since you cannot have a negative number of walks, there is no solution to this problem.  In other words, the costs can never be equal no matter how many dog walks are made!