हल करना (20)^(-x)=7,(400)^(2x)= | Equatix - Math Solver

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a⋅(b-2)=3b

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

a⋅(b-2)=3b

Question

$${ 20 }^{ -x } =7, { 400 }^{ 2x } =$$