dimetahui f(x)=(2x+3); jika f(a)=-7 danf(2)=b nilai a+b adalah

f(x) = 2x + 3

f(a) = -7
2a + 3 = -7
2a = -7 - 3
a = -10/2
a = -5

f(2) = b
2. 2 + 3 = b
b = 7

a + b = -5 + 7 = 2