Subtract `24ab-10b-18a` from `30ab-12b+14a.`

Subtract : -1/2 ab " from " -2/3 ab

Subtract ab-bc-ca " from " -ab+bc+ca .

Subtract 2(ab+bc+ca) " from " -ab-bc-ca .

Subtract: 5a^2-7ab+5b^2 from 3ab-2a^2-2b^2

Subtract : 2 ab + 5 bc - 7 ac from 5 ab - 2 bc - 2 ac + 10 abc

Subtract 4a-7ab+3b+12 from 12a-9ab+5b-3

Subtract -a^2-ab " from " b^2 +ab .

Subtract 5 ab - 7 a - 4b from 9 ab - 8a + 5b

Subtract the sum of 12ab-10b^2 -18a^2 and 9ab + 12 b^2+ 14a^2 " from the sum of " ab + 2b^2 and 3b^2-a^2 .