Question 13551
(4x + 1) - (x + 4) = 18

Set this equation up vertically <font size="-1"> it might be easier</font>:
   4x + 1
-1x - 4
   -------
   3x + -3   ...   REMEMBER TO SUBTRACT THE 4 FROM THE ONE, NOT ADD THEM

3x - 3 = 18
Add 3 to each side:
3x - 3 + 3 = 18 + 3
3x = 21
Divide both sides by 3:
3x/3 = 21/3
{{{x = 7}}}

Check: (4(7) + 1) - (7+4) = 18
(28 +1) - (11) = 18
29 - 11 = 18
18 = 18
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<marquee behavior="alternate">Solved By: NtNk</marquee>