Then his non vote for Hillary was as much a vote for Trump, Edison.
...but your math isn't much better.
You really shouldn't be so derogatory of anybody's math skills when you, yourself, are oblivious and apparently failed arithmetic. You have 22 voters, 20 of them vote, and the count is 10 for Hillary, 10 for Trump. Along comes Jeb Bush's Mini Me and another Democrat. They vote. Hillary stands at 11 votes, Trump still at 10, with Jeb gaining 1 squandered vote, sucked into a black hole, and the result that Hillary, the Democrat, is elected, and by the actions of Mini Me, the Republican. A vote that's not for Trump cannot help Trump, does him no good at all, rather, clearly, helps his opponent, is very much a vote for Hillary, in this very instance of a Republican with a man-crush on Jeb. Liberalism in the flower of all it's stinking corruption for everybody ensues, on steroids, Hillary's cause and liberalism advanced because of this Republican, with a man-crush on Jeb, who couldn't see the forest for the trees.
I hope this example, intentionally made elementary school simplistic, will give you a perspective on how it really works, how numbers work, and then, Lord willing, you may someday move on to multiplication and division. In the meantime, perhaps cease to castigate the math or critical thinking skills of anybody else on the planet over, let's say, 8 years old?