Question

`-1/4 +3/4a= -(-7/4a-1)`

Answer 1

`-(1)/(4)+(3)/(4)a=-\left(-(7)/(4)a-1 \right)`

Multiplying both sides by 4,

`-1+3a=-(-7a-4)\\\\-1+3a=7a+4\\\\-1=4a+4\\\\-5=4a\\ \\ a=\boxed{-1.25}`