Let

x = the current age of Alexis

y = the current age of Cameron

Cameron is 7 years older than Alexis means:

y = x + 7

In 6 years the sum of their ages will be 57 means:

(x + 6) + (y + 6) = 57

We need to solve the following system of equations:

y = x + 7

(x + 6) + (y + 6) = 57

........

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........

x = 19 years

y = 26 years

Cameron is 26 years old now.