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f(a+1) = 10
2(a+1)-3 = 10
2a+2-3 = 10
2a = 10-2+3
2a = 11
a = 11/2
10 = 2 (a+1) - 3
10 = 2a + 2 - 3
10 = 2a - 1
2a = 11
a = 5,5