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# A Function of a Constant

SATMAT-TEVBR1

If $f(x)=-3x-7$ and $f(2)-f(a)=1.5$, then what is the value of $f(a+1)$? (Calculator)

A

$-17.5$

B

$-14.5$

C

$-13.5$

D

$-2.5$