Solve x-2/4=10
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x/2+4 = 10 // - 10

x/2-10+4 = 0

1/2*x-6 = 0 // + 6

1/2*x = 6 // : 1/2

x = 6/1/2

x = 12

x = 12

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb