Question

решите уравнения
2х-10=6х+14
6у-9=3у-27
0.4(х-9)-0.3(х12)=0.7

Answer 1

$2x - 10 = 6x + 14 \ 2x - 6x = 14 + 10 \ - 4x = 24 \ - x = 6 \ x = - 6$

$6y - 9 = 3y - 27 \ 6y - 3y = - 27 + 9 \ 3y = - 18 \ y = - 6$

$0.4(x - 9) - 0.3(x - 12) = 0.7 \ 0.4x - 3.6 - 0.3x + 3.6 = 0.7 \ 0.1x = 0.7 \ x = 7$

Answer 2

1)

$2x - 10 = 6x + 14 \ 2x - 6x = 14 + 10 \ - 4x = 24 \ x = - 6$

2)

$6y - 9 = 3y - 27 \ 6y - 3y = - 27 + 9 \ 3y = - 18 \ y = - 6$

3)

$0.4(x - 9) - 0.3(x - 12) = 0.7 \ 0.4x - 3.6 - 0.3x + 3.6 = 0.7 \ 0.4x - 0.3x = 0.7 \ 0.1x = 0.7 \ x = 7$