РЕШИТЕ УРАВНЕНИЯ 
1)x^2-6x=5x-12-x^2
2)-3x^2-x+8=(x-3)^2
3)-x^2+3x+55=(x+7)^2
СРОЧНО!!!!!!!!!!!!!!!!СРОЧНО!!!!!!!!!!!!!!!!!СПАСИБО ЗА РАНЕЕ !!!!!!!!
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