(x-3)4-5(x-3)2-36=0
(x-3)4-5(x-3)2=36
(4-5×2)(x-3)=36
(4-10)(x-3)=36
-6(x-3)=36
x-3=-6
x=-6+3
x= - 3
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(x-3)4-5(x-3)2-36=0
(x-3)4-5(x-3)2=36
(4-5×2)(x-3)=36
(4-10)(x-3)=36
-6(x-3)=36
x-3=-6
x=-6+3
x= - 3