they will raise taxes while cutting the budget. in a multiparty system there are ways to achieve politically unpalatable things. in Italy we have what we call "technical governments", we don't vote for the government, only for parliament, and they elect the government, when nobody has a clear majority they vote for a "compromise" government where they elect a prime minister that is from no party, usually an economist or someone like that, which carries out the politically unpalatable reforms, in France they will do it with a split parliament/presidency