Resolver [ delta(-21)+(-5) xi]*(-4)-20]/3 | 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

$$[\delta(-21)+(-5)\xi]\times(-4)-20]\div3$$