Question 1028899
(a) is not an equation ( no = sign )
(b) 
{{{ log(2) + log( 4x-1 ) = 3 }}}
The key here is to express {{{ 3 }}} as a log
{{{ log(2) + log( 4x-1 ) = log( 1000 ) }}}
{{{ log( 2*( 4x-1 ) ) = log( 1000 ) }}}
{{{ 2*( 4x-1 ) = 1000 }}}
{{{ 8x - 2 = 1000 }}}
{{{ 8x = 1002 }}}
{{{ x = 125.25 }}}
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check answer:
{{{ log(2) + log( 4x-1 ) = 3 }}}
{{{ log(2) + log( 4*125.25-1 ) = 3 }}}
{{{ log(2) + log( 501-1 ) = 3 }}}
{{{ log(2) + log( 500 ) = 3 }}}
{{{ log( 2*500 ) = 3 }}}
{{{ log( 1000 ) = 3 }}}
{{{ 10^3 = 1000 }}}
{{{ 1000 = 1000 }}}
OK