Question

2) 10x+3=5
3) -8x+9=-7
4) -3x+4=7x
5) x+12=3x

Answer 1

10x=5-3
10x=2
  x=5

-8x+9=-7
-8x=-7-9
-8x=-16
 x=2

-3x+4=7x
-3x-7x=-4
-10x=-4
   x=0,4

x+12=3X
x-3x=-12
-2x=-12
   x=6

Answer 2

10*5=2????