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  1. To cancel out the X's find the least common multiple of 5 and 4:

     multiples of 5: 5, 10, 15, 20, 25, 30

    multiples of 4: 4, 8, 12, 16, 20, 24

    the least common multiple of 5 and 4 is 20, 
     so we need to multiply 5x and 4 x by numbers that would make-20 and 20 ( -20+20 = 0) which would cancel them out
     

    5 x -4 = -20

    4 x 5 = 20

    -20 + 20 = 0  

    the 3rd answer would cancel out the x's

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