Subtract: 4p-3q+5r from 7p-6q-r
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7p-6q-r-(4p-3q+5r)=0
7p-6q-r-4p+3q-5r=0
3p-3q-6r=0
3(p-q-2r)=0
p-q-2r=0
p-q=2r
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