book Maths Puzzle Numerical Ability

Please Help Me Again!!Thanks For The Other Help,too!
5x=4y-7
4x=5y-2
thank you!!!!!!!!!!

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book Other Question

My teacher has our advanced algebra class taking college algebra tests just for the heck of it.
The problem asks to find a polynomial equation of degree 4 with integral coefficients that has solutions 1+i, 3, 0. consider- log3 135 *log3 15
can this be written as (log3 135*15)raised to the power2 ?