There are infinitely many possible answers:
2*45 or 0.03*3000
assuming that you want whole number factors
1x90, 2x45, 3x30, 5x18, 5x15, 9x10 and, if you want integers use the same pairs with both numbers negative
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20 x 90 = 180020 times 90 equals 18 times 100 equals 1800.
It equals 90
If you mean: 15a = 6a - 90 then the variable a works out as -10. If you mean 15a + 6a - 90, then it equals 21a - 90.
90 + 90 + 60 = 240
2.5*36 = 90