3(2x-1)+6(2x+1)=2(x+3)-5(1-2x) 4(3x-1)+6(x+2)=10(x-3)

6х - 3 + 12х + 6 = 2х + 6 - 5 + 10х
18х + 3 = 12х + 1
18х - 12х = - 3 + 1
6х = - 2
  х = - 2/6
  х = - 1/3

12х - 4 + 6х + 12 = 10х - 30
12х + 6х - 10х = 4 - 12 - 30
8х = - 38
  х = - 4  6/8 = - 4  3/4

3(2x-1)+6(2x+1)=2(x+3)-5(1-2x)
6x-3+12x+6=2x+6-5+10x
6x+12x-2x-10x=6-5+3-6
6x=-2
x=-2:6
x=-1/3

4(3x-1)+6(x+2)=10(x-3)
12x-4+6x+12=10x-30
12x+6x-10x=-30-12+4
8x=-38
x=-38:8
x=-38/8
x=-19/4
x=-4 3/4