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

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