Question

5 (x+7)-10 =50

42 :x-5 =1

(x-1)(x-4) =5

7x+8x-5x = 70

4x+ 9 x - x = 60 

Answer 1

1) 5 ( x + 7 ) - 10 = 50 => 5 ( x + 7 ) = 60 

=>  x + 7 =12 

=> x = 12 - 7 

=> x = 5

2) 42 : x - 5 = 1

=> 42 : x = 6

=> x = 7

3) ( x-1 ) ( x- 4 ) = 5

=> x = - 0,1925.....

4) 7x + 8x - 5x = 70

=> 10x = 70

=> x = 7

5) 4x + 9x - x = 60

=> 12x = 60 

=> x = 5

Answer 2

*)5(x+7)-10=50

5(x+7)=60

x+7=12

x=5

*)42:x-5=1

42:x=6

x=7

*)7x+8-5x=70

x(7+8-5)=70

10x=70

x=7

*)4x+9x-x=60

x(4+9-1)=60

12x=60

x=5