Раскройте скобки приведите подобные слагаемые:
(3x+y) - (-x-4y)
(x+6y) - (8x-7y)
(m+n) - (m-n)
(3x+y) - (-x-4y)
(x+6y) - (8x-7y)
(m+n) - (m-n)
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1)(3x+y) - (-x-4y)=3х+у+х+4у=4х+5у; ////2)(x+6y) - (8x-7y)=х+6у-8х+7у=13у-7х; ///3)(m+n) - (m-n)=m+n-m+n=2n;