[input]1/5 + 5x= 7x -18[/input]
1/5 + 5x= 7x -18
subtract (7x -18) on both sides
1/5 + 5x-(7x -18) = ( 7x -18)-( 7x -18)
1/5 + 5x-7x +18 = 0
1/5 -2x+18 = 0
1/5 +18-2x = 0
18.2-2x = 0
add 2x on both sides
18.2-2x+2x = 2x
18.2 = 2x
divide both sides by 2
2x/2 = 18.2/2
x = 9.1
+3146 
