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There are no mathematical operators between 8 and x nor between x and -6.
6 x x=8
6 x 8 = 48
Its a little confusing. If the number is a the product of a number times itself. Such as 8 x 8 = 64, 4 x 4 = 16, 6 x 6 = 36
x2 + 8 = 6x ie x2 - 6x + 8 = 0. This factorises as (x - 2)(x - 4), so x is either 2 or 4. Check: 4 + 8 = 6 x 2 OK, 16 + 8 = 6 x 4 OK QED
71-ans x<8(6+3) x<8(9) x<72 therefore,x=71