Menyelesaikan 4/7+-8/9+-13/7+17/21 | 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

$$4/7+-8/9+-13/7+17/21$$