1. (3х+у)-(-х-4у) =3х+у+х+4у=4х+5у
2. (х+6у)-(8х-7у) =х+6у-8х+7у=-7х+13у
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1. (3х+у)-(-х-4у) =3х+у+х+4у=4х+5у
2. (х+6у)-(8х-7у) =х+6у-8х+7у=-7х+13у