Упростить:(5а-12в)-(8а-3в)
(5а-12в)-(8а-3в) = 5а-12в-8а+3в = (5а-8а)-(12в-3) = -3а-9в
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(5а-12в)-(8а-3в) = 5а-12в-8а+3в = (5а-8а)-(12в-3) = -3а-9в