Question

Поиогите =) решите уравнение: 6х=36. 4х-28=0. 3х+2=-19. 5-9х=-13. 3х-12=-х+6. 6+2х=-х+15. 2х/3+х/4=11/12. 2(х-2)/7=-3. 1/3(х-1)+1/2(х+3)=12. 3-х/5=8+3х/2.

Answer 1

$6x=36\\x=36:6\\x=6\\\\4x-28=0\\4x=28\\x=28:4\\x=7\\\\3x+2=-19\\3x=-19-2\\3x=-21\\x=-21:3\\x=-7\\\\5-9x=-13\\-9x=-13-5\\-9x=-18\\x=-18:(-9)\\x=2\\\\3x-12=-x+6\\3x+x=6+12\\4x=18\\x==18:4\\x=4.5\\\\6+2x=-x+15\\2x+x=15-6\\3x=9\\x=9:3\\x=3\\\\\frac{2x}3+\frac x4=\frac{11}{12}\\\frac{8x+3x}{12}=\frac{11}{12}\\\frac{11x}{12}=\frac{11}{12}\\x=\frac{11}{12}:\frac{11}{12}\\x=1\\\\\frac{2(x-2)}7=-3\\2x-4=-3\cdot7\\2x-4=-21\\2x=-21+4\\2x=-17\\x=-17:2\\x=-8.5$

$\frac13(x-1)+\frac12(x+3)=12\;\;\;\;\times6\\2(x-1)+3(x+3)=72\\2x-2+3x+9=72\\5x+7=72\\5x=72-7\\5x=65\\x=13$

Answer 2

х=6

4х=28

х=7

3х=-21

х=-7

-9х=-18

х=2

3х+х=6+12

4х=18

х=4,5

2х-х=15-6

х=11