I'll give you a clue:
64 x 5 is the same as 32 x 10, a much easier sum.
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Instead of writing 4 x 4 x 4 = 64 you can write it in exponent form, thus: 43 and get the same answer of 64 If you see 54 it is the same as 5 x 5 x 5 x 5 = 625 (Don't assume that 54 is 5 x 4 = 20 - big difference!)
1 unit x 64 units 2 units x 32 units 3 units x 64/3 = 21.3... units 4 units x 16 units 5 units x 64/5 = 12.8 units 6 units x 64/6 = 10.66.. units And you could do 1.1 x , 1.2 x etc
5x3 = 320 x3 = 320/5 = 64 So x = cuberoot(64) = 4
10x2 - 64 = 36 + 6x2; whence, 4x2 - 100 = 0, x2 = 25, and x = ±5.
72