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a) 7 (x+2)- 2 (8-4)=6(x+2)-9​

Răspuns :

a) 7 (x+2)- 2 (8-4)=6(x+2)-9

7 (x+2)- 2 ×4=6(x+2)-9

7 (x+2)- 8=6(x+2)-9

7x+14-8=6x+12-9

7x+6=6x+3

7x-6x=3-6

x=-3

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Răspuns:

Explicație pas cu pas:

7*x+7*2-2*8+2*4=6*x+6*2-9

7x+14-16+8=6x+18-9

7x-6x=16-14-8+18

x=12

stim ca (-2)(-4)=+2*4=8