It is a variable which, in the given expression, can have any value you like.
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CBM is cubic metre, that is m^3 m x m x m = m^3 hence to obtain m from m^3, find (cube root) of m^3. For example, to obtain the m 125m^3, = (cube root) of 125m^3, that is, 5m. Proof: 5m x 5m x 5m = 125m^3
-5m-3+4 = 11 -5m = 11+3-4 -5m = 10 m = -2
5m - 5 + 2 = 1 Therefore, 5m - 3 = 1 5m = 4 m = 4/5 m = 0.8
m=3/13
3+4m+5m=214m+5m=21-39m=18m=18/9m=2