7-2х=9-3х 11х=6+5(2х-1) 6(2х-3)-3х=2х-4 4(3х+5)-5(4х-3)=3 5х-3(4х-1)=7-2(7х+2) -5,6(х-3)+2,1х=-3,5х+10

7 - 2X = 9 - 3X  2X - 3X = 7 - 9  - X = - 2  X = 2  ------------------ 11X = 6 + 10X - 5  11X - 10X = 1  X = 1  ------------------ 12X - 18 - 3X = 2X - 4  9X - 2X = - 4 + 18  7X = 14  X = 2  ------------------ 12X + 20 - 20X + 15 = 3  - 8X = 3 - 35  - 8X = - 32  X = 4  -------------------- 5X - 12X + 3 = 7 - 14X - 4  - 7X + 14X = 3 - 3  7X = 0  X = 0  --------------------- - 5,6X + 16,8 + 2,1X = - 3,5X + 10  - 3,5X + 3,5X = 10 - 16,8  0X = - 6,8  Нет решений 

[latex]7-2x=9-3x \\ -2x+3x=9-7 \\ x=2 \\ \\ 11x=6+5(2x-1) \\ 6+10x-5=11x \\ x=1 \\ \\ 6(2x-3)-5(4x-3)=3 \\ 12x-18-20x+15=3 \\ -8x=3+3 \\ -8x=6 \\ x=-0.75[/latex] [latex] \\ \\ 4(3x+5)-5(4x-3)=3 \\ 12x+20-20x+15=3 \\ -8x=-32 \\ x=4 \\ \\ 5x-3(4x-1)=7-2(7x+2) \\ 5x-12x+3=7-14x-4 \\ 7x=0 \\ x=0 \\ \\ -5,6(x-3)+2,1x=-3,5x+10 \\ -5,6x-16.8+2.1x=-3.5x+10 \\ -3.5x+3.5x=-6.8 \\ 0x=-6.8 \\ x=[/latex] нет корней Автор я!