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A) -12(x+10)=-96 B) -12(7x-15)=-156 C)3x-9+x=2x-27 D)48:(2x+10)=6

Răspuns :

Ana43Marya16

-12x+(-120)=-96/•(-1)

12x+120=96

12x=96-120

x=-24/12

x=-2



B) -12(7x-15)=-156

-12•7x-15•-12=-156

C)3x-9+x=2x-27

3x-2x+x=-27+9

2x=-18

x=-18/3=-9

D)48:(2x+10)=6

48:(2x+10)=(12x+20)/(2x+10)

48=2x+10

38=2x

x=38/2=19

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