Question

-3х-9=3х
помогите решить и эти
2: -2х-4=3х
3: -8х-3=-6х
4: 7+8х=-2х-5
5: 10(х-9)=7​

Answer 1

$- 3x - 9 = 3x \ - 3x - 3x = 9 \ - 6x = 9 \ x = 9 div ( - 6) \ x = - 1.5 \ - 2x - 4 = 3x \ - 2x - 3x = 4 \ - 5x = 4 \ x = 4 div ( - 5) \ x = - 0.8 \ 7 + 8x = - 2x - 5 \ 8x + 2x = - 5 - 7 \ 10x = - 12 \ x = ( - 12) div 10 \ x = - 1.2 \ 10 times (x - 9) = 7 \ 10x - 90 = 7 \ 10x = 7 + 90 \ 10x = 97 \ x = 97 div 10 \ x = 9</strong><strong>.</strong><strong>7$