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(-2x+36-1/9x²+2x) + (1/3x-4)(1/3x-4)=4
(-1/9x²+36) + (1/9x²-4/3x-4/3x+16)=4
-1/9x²+36+ 1/9x²- 8/3x +16=4
-8/3x+52=4
-8/3x=4-52
-8/3x=-48/*3
-8x=-144 //:(-8)
x=18