Oh, dude, 1.5 equals 90? That's a big nope. Like, not even close. 1.5 is like, 1.5. It's not magically turning into 90 anytime soon.
90 minus 75 =15 therefore 15 + 75 = 90
6 x 15 = 90
15 times 90 equals 1350.
105
15 + 80/90 = 143/9 = 15.888
81
90 divided by 6 equals 15.
sigh, 18...
0.45
6
15 times 6 = 90
15z = 15 x 6 = 90