Resolver find the number of terms an Ap 2,-9,-20***-141 | Equatix - Math Solver

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Example

3(r+2s)=2t-4

a⋅(b-2)=3b

3(r+2s)=2t-4

a⋅(b-2)=3b

Question

$$2 , - 9 , - 20 , - 14 !$$