There is only one step.
Divide both sides by 5
5*a/5 = 125/5
On the left side, the 5's cancel out leaving a by itself.
a = 125/5 = 25
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If: -5a = 300 Then: a = -60
(5a).7 = -23 7(5a) = -23 35a = -23 a = -23/35 a= -0.657 (3 d.p.)
2a+5a+9a = 16a
A= 2
6a + 4 = 5a - 2 means that 6a - 5a = -2 - 4 which gives a = -6