I just wan't to align the equation like this example (Of course, I can't align these equations on the web page):
∵△ABC ≌ △A′B′C′ ∴∠ABC = ∠A′B′C′ ∠ACB = ∠A′C′B′ ∠BAC = ∠B′A′C′
If I use
&, these will be to much spaces...
You can use a space