4y^4(9x+5)^8-3y^3(9x+5)^7

(9x+5)^7[ 4y^4(9x+5)-3y^3]

(9x+5)^7[ y^3{4(9x+5)-3}]

(9x+5)^7[ y^3{36x+20-3}]

(9x+5)^7[ y^3{36x+17}]

(9x+5)^7 (y^3)(36x+17)

you can find the values of x and y by putting each factor equal to zero.....

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