1) x-14/x-7=2/3 2) x-12/x-13=12/11 3) x-12/x=-4 4) x-12/x=4

Question

1) x-14/x-7=2/3 2) x-12/x-13=12/11 3) x-12/x=-4 4) x-12/x=4

Answer 1

1)(x-14)/(x-7)=2/3    // *3(x-7)    D:  x-7#0       x≠7

3(x-14)=2(x-7)

3x-42=2x-14

3x-2x=42-14

X=28

2)(x-12)/(x-13)=12/11   // *11(x-13)        D:  x-13≠0   ,  x≠13

11(x-12)=12(x-13)

11x-132=12x-156

X=24

3)(x-12)/x =-4   // *x          D:   x≠0

x-12=-4x

x+4x=12

5x=12

X=12/5 = 2 2/5

4) (x-12)/x =4   // *x      D:x≠0

   x-12=4x

3x=-12

X=-4