How much smaller is 15x - 18y + 19z than 22x - 20y -13z +26?
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(22x - 20y -13z + 26) - (15x - 18y + 19z)
= 22x - 20y -13z + 26 - 15x + 18y - 19z
= (22x - 15x) + (- 20y + 18y) + (-13z - 19z) + 26
= 7x - 2y -32z + 26
Hence, (22x - 20y -13z +26) is less than (15x - 18y + 19z) by (7x - 2y -32z + 26)
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