Is - 2 (3x-7) equivalent to 19+12x-5-6x? YES or NO?

6. 6x-21=33+9x 7. - 15x=-5 (3x+7) 8. 16x-19=113-6x 9. - 19x-34=56-x 10. - 6 (4x+3) = 6 (4x-3) ?

6. 6x-21 = 33 + 9x

+21 + 21

6x = 54 + 9x

-9x - 9x

-3x = 54

/3 / 3

x = - 18

7. - 15x = - 5 (3x+7)

First multiply the - 5 to the other numbers.

-15x = - 15x - 35

0x = - 35

7 is impossible I believe.

8. 16x-19 = 113-6x

+6 + 6

22x - 19 = 113

+ 19 + 19

22x = 132

/22 / 22

x = 6

9. - 19x - 34 = 56 - x

+19x + 19x

-34 = 56 + 18x

-56 - 56

-90 = 18x

/18 / 18

x = - 5

10. - 6 (4x+3) = 6[4x-3]

-24x - 18 = 24x - 18

+18 + 18

-24x = 24x

x = 0, since only zero can make the equation true.