Como simplificar equações do segundo grau passo a passo valendo 10 pontos?

como simplificar essa equações:

a) 2x(3x+5)-3x=2x²+9

b)x(5x-3)+x²=6x

c)-x(-x+8)+2x=4x-1

d)x(3x-6)+2+3x=-3x+5

e)(x-1)(2x+1)=x²-1

f)2x(x-3)+6x=4x²

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