Elimina signos de agrupación y resuelve.
5. 3(x+2)-2(2x-1)=6x+1
6. 2(x+1)= (x + 1) +4
7. 2(x-3)(x+3)-(3x+4)=x(2x-5) - 18
8. (x+3)2-2[x(1+x)] = x(2-x)
9.
(2x-1)² = 4x(x-2)
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