exam Maths Puzzle Numerical Ability

slove algebraically log base 4 (x+41)- log base 4(2x-5)=2

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I need help on solving this equation. it says to Write an equation in standard form for the line whose slope is undefined and passes through (-6, 4). I have spent a really long time working on this and cannot figure out where to start. Please help me. each pair of points lie in a line with a given slope. find x.
(4,3), (x,7) slope=2
how would you complete this??