Question

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Answer 1

Răspuns:

Explicație pas cu pas:

Answer 2

Răspuns:

1) 7x+80=10

7x=10-80

7x=-70

x=-10

2) 3(x+4)=15

3x+12=15

3x=15-12

3x=3

x=1

3) 7(8-x)=2(x+2)

56-7x=2x+4

56-4=2x+7x

52=9x

x=52/9

4) 3(2x-4)=18

6x-12=18

6x=18-12

6x=6

x=1

5) 46=(8x-9)*2

46=16x-18

46+18=16x

64=16x

x=4

Succes !