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=6a-9a+7b-5b
=-3a+2b
b.10u-6v-9v-13u
=10u-13u-6v-9v
=-3u-15v
c.x^2+6xy+7x-4x^2+5x
=x^2-4x^2+6xy+7x+5x
=-3x^2+6xyy+12x