So this is....not that big an amount? 4.4% of a fairly small budget relative to the total country.
Further, Alberta has had a large net inflow of young, productive workers from the rest of Canada. If there was no oil, these workers would mostly go work and be productive elsewhere, increasing local tax revenues.
Alberta did contribute wealth to the rest of the country. But Albertans tend to both overestimate this contribution and also ignore that they benefit from young workers trained and educated by provincial budgets elsewhere.
Source for equalization percent: https://en.m.wikipedia.org/wiki/Equalization_payments_in_Can...
(Alberta is not the only province to pay into equalization)