You are doubling the amount added each time:
1 + 3 = 4
4 + 6 =10
10 + 12 = 22
22 + 24 = 46
46 + 48 = 94
94 + 96 =190
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Double, add two, double, add 2, ...
the next three numbers are 180 540 and 1620=)
46
Do you mean 5u-10 = u+46? If so then:- 5u-10 = u+46 5u-u = 46+10 4u = 56 u = 14
22