Answer :

[tex]Use\ distributive\ property:\\\\-3(4x-4)=-3(4x)-3(-4)=-12x+12\\==========================\\\\7x(3+4)=7x(7)=49x[/tex]
i think u do distributive property 3*4x = -12x+12 =0
negative 12 to both sides and it equals -12x=12
                                                         x=-1

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