First of all expand the bracket by multiplying what is inside by 5:
5(x+4)+3=18
5x+20+3=18 (5*x=5x and 5*4=20)
Then we collect all of the multiples of x on one side and all of the normal numbers on the other:
5x+20+3=18
5x+23=18 (add the 20 and 3)
5x=18-23 (subtract 23 from both sides)
5x= -5
Now that it is in this layout we divide both sides by five to give:
x= -1
Hope that helps!
