Question

7(x+3)-5(x+7)=7(x-5)-4(x-7)
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Answer 1

7(x+3)-5(x+7)=7(x-5)-4(x-7)

7x+21-5x-35=7x-35-4x+28

2x-14=3x-7

=> -14+7=3x-2x => x=-7

(-)·(-)=(+)

(+)·(+)=(+)

(+)·(-)=(-)

Cand treci un nr dupa egal il treci nu semn schimbat

Ex: -3x=4 => 0=4+3x

Answer 2

Răspuns:

Explicație pas cu pas:

7 ( x + 3 ) - 5 ( x + 7 ) = 7 ( x - 5 ) - 4 ( x - 7 )

7 x + 21 - 5 x - 35 = 7 x - 35 - 4 x + 28

2 x - 14 = 3 x - 7

2 x - 3 x = - 7 + 14

- x = 7

x = - 7