No that would be a3. 3a is 3 x a. Think of it as 3 a's.
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it will be a cube or a to the power of 3.
If 3a+5=5a+3, then: 3a+5 - 3a = 5a+3 - 3a 5=2a+3 5 - 3=2a+3 - 3 2=2a a=1
a/(3a) = 1/3
-3a-12 = 12+12 +12-3a = +12~ ~-3 -3a = -8
4a7 / 3a3 = ( 4/3 ) x ( a7/a3 ) = 4a4 / 3