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a) 7x-9=3x+7 b) -2x+11=-5x-10

Răspuns :

A) 7x-3x =9+7 4x=16 x=16:4=4 B) -2x+5x=-11-10 3x=-21 x= -21 :3 =7
[tex]\displaystyle a).7x-9=3x+7 \\ 7x-3x=7+9 \\ 4x=16 \\ x= \frac{16}{4} \\ x=4 \\ b).-2x+11=-5x-10 \\ -2x+5x=-10-11 \\ 3x=-21 \\ x=- \frac{21}{3} \\ x=-7[/tex]