2/x-7=+3/x+2 8-3(1-4x)=2x 2(x-5)-x=4(x+1)

soalnya yg pertama begini kan (koreksi kalau salah) :
[tex]\frac{2}{x-7} = \frac{3}{x+2}[/tex]
maka : 
[tex]\frac{2}{x-7} = \frac{3}{x+2} \\ 2(x+2) = 3(x-7) \\ 2x +4 = 3x-21 \\ 2x-3x = -21 -4 \\ -x = -25 \\ x = 25[/tex]

soal kedua :
[tex]8-3(1-4x)=2x \\ 8-3+12x = 2x \\ 5 = 2x -12x \\ 5 = -10x \\ \frac{5}{-10} = x \\ - \frac{1}{2} = x [/tex]

soal ketiga : 
[tex]2(x-5)-x=4(x+1) \\ 2x -10-x=4x+4 \\ 2x-x-4x=4+10 \\ -3x = 14 \\ x = - \frac{14}{3} \\ x = -4 \frac{2}{3}[/tex]