Resolver 20/4 * 2 / 5 - 1; - 9 - (- 3) - 12/3 | 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

$$20\div4\times2\div5-1; -9-(-3)-12\div3$$