Найдите корень уравнения 1-5x=3(7-x)

Question

Найдите корень уравнения 1-5x=3(7-x)

Comments

1-5x=3(7-x)

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1-5x=21-3x -5x+3x=21-1. -2x=20 x=20:-2 x=-10

Answer 1

1 - 5х = 3(7 - х)
1 - 5х = 21 - 3х
- 5х + 3х = 21 - 1
- 2х = 20
х = 20 : (- 2)
х = - 10
______________
1 - 5*(-10) = 3(7 - (-10))
1 + 50 = 3*(7 + 10)
51 = 3*17
51 = 51
Ответ: х = - 10

Darknight (Sunny Storm)

Answer 2

1-5х=21-3х
-5х+3х=21-1
-2х=20
х=-10