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2015-02-09T22:09:44+08:00

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Just line them up like subtracting whole numbers like for example:
Those number that are joined with x can only subtract or be subtracted from numbers that have x also or 0.
Ex.
      2x - 1 = 2x - 1
     2x -x = x
    10x - 6x = 4x
     15x² - 10x = 15x² - 10x
     15x² - 10x² = 5x²
     15x³ - 10x² = 15x³ - 10x²
     15x³ - 10x = 15x³ - 10x
     15x³ - 10x³ = 5x³

3x - 7 subtracted by 2x + 1
       3x - 7 
-
       2x + 1
  =  x - 8

3x² + 5 subtracted by x² + 3x + 2

     3x² +  0 + 5

     x² + 3x + 2
  = 2x² -3x + 3

0