раскройте скобки
(8х-3у)*12
100*(47а+93б-78)
(23z-81+42t)*3
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100*(47а+93б-78)=100*47а+100*93б-100*78=4700а+9300б-7800
(23z-81+42t)*3=3*23z-3*81+3*42t=69z-243+126t
4700а+9300б-7800
69z-243+126t