I'll solve one from each kind
Q1)
6 = a/4 + 2 <em>(mutiply both sides)</em>
24 = a + 8 <em>(move the terms)</em>
-a = 8 - 24 <em>(calculate)</em>
-a = 8 - 16 <em>(change the signs)</em>
a = 16
Q8)
2( 2 + 5) = -2 <em>(divide both sides)</em>
n + 5 = -1 <em>(move the constant to the right)</em>
n = -1 - 5<em> (calculate)</em>
n= -6
Q3)
9x - 7 = 7 <em>(cancel equal terms)</em>
9x = 0 <em>(divide both sides)</em>
x = 0