Find and simplify f(a) +f(6) for the function $f(x)=12x-7$ .

A) $f(a)+f(6)=12a+58$
B) $f(a)+f(6)=12a+79$
C) $f(a)+f(6)=12a+36$
D) $f(a)+f(6)=12a+11$
E) $f(a)+f(6)=12a+72$

Simplify

To simplify an expression means to reduce it to its simplest form, by performing all possible operations and combining like terms.

Evaluate

To calculate the value of an expression by substituting variables with given numerical values and performing the operations in the expression.