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Determinati numarul real m pentru care:
a)ecuatia 2x-m(x+3)=7mx+12are solutia 5
b)ecuatia -3x+4(mx-1)=6x+2-7(m+2)are solutia 3
c)ecuatia 3(m-1)(x+2)-2(2m-1)(2x+1)=7x+3mx-5are solutia -3