book Maths Puzzle Numerical Ability

Find all real solutions for log4+log+4(x-12)=3

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book Other Question

how would u solve ax+5y=b and 6x+10y=16 when the two equations are the same line.(no graphing) I know that that the first equation is basically half the second equation, and i have I could not find an appropriate title, this was the closest one. Sorry.

I have to multiply and simplify two sets of radicands.

(radicand 3x- radicand5x)(radicand2x+radicand5