Easy Algebra One ~ Please help

1)

\(7=-\dfrac{3}{4x}\\ 28x = -3\\ x = -\dfrac{3}{28}\)

 

2)

\(50 = -2 + 13q\\ 13q = 52\\ q = 4\)

 

3)

\(5-\dfrac{9}{2d}=32\\ \dfrac{9}{2d}=5-32\\ \;\;\quad\!=-27\\ 2d = -\dfrac{9}{27}\\ \;\;\;\;\!\;\!=-\dfrac{1}{3}\\ d = -\dfrac{1}{6}\)

 

4)\(\dfrac{7a+1}{2}=18\\ 7a + 1 = 36\\ 7a = 35\\ a = 5\)