Parentheses are not needed for fractions in type-set texts because it is graphically clear. When transferred to a one-line expression, parentheses are required around the numerator and denominator.
I assume the question is as follows, which is different from what you posted because of the missing parentheses.
From log(2)=a, and log(3)=b,
we deduce that
cross multiply (1), assume 3≠6^(-x)
3*6^x - 6^0 = 10 .... (6^0 = 1)
3*6^x = 11
6^x = 11/3
take log on both sides
x(log(2)+log(3) = log(11)-log(3)
x = (log(11)-b)/(a+b)
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