99-23x+x⁹-9x⁸=-(17x+153-x⁹+9x⁸)
99-23x+x⁹-9x⁸=-17x-153+x⁹-9x⁸
-23x+17x=-153-99
-6x=-252
x= 42
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99-23x+x⁹-9x⁸=-(17x+153-x⁹+9x⁸)
99-23x+x⁹-9x⁸=-17x-153+x⁹-9x⁸
-23x+17x=-153-99
-6x=-252
x= 42