well since you don't know what x is, you just assume that x is now x/7 0r x divided by 7.
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If the equation is (5x + 3 - 7) / 2 = 56, than x = 23.2
2
7/x^6 = 7x^-6
If you mean: 7x = 49 then the value of x is 7
if x2 = 5 the value of x has to be 5 divided by 2 which is 2.5 x = 2.5