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8x-7(4x-3)-(9x+5)-12=9-2(7x-3)+(4x-5)=


Răspuns :

8x-7(4x-3)-(9x+5)-12=9-2(7x-3)+(4x-5)=8x-28x+21-9x-5-12=9-14x+6+4x-5=-29x+9=15-10x=-29x+10x=15-9=-6/19