(x-7)²-3x(7-x)=0

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(x-7)²-3x(7-x)=0(x-7)²-3x(7-x)=0(x-7)²-3x(7-x)=0x=7

(x-7)²-3x(7-x)=0
(x-7)²-3x(7-x)=0

(x-7)²-3x(7-x)=0
x=7