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7 (x-3)=9 (x+1) va rog! e urgent!

Răspuns :

7X-21=9X+9
2X=-30
X=-30/2
X=-15

(x-3)+[-(x+1)=9*(-7)
(X-3)-(x+1)=(-63)
x-2=(-63)
x=(-63)-2
x=(-65)