हल करना 21 - 3(a - 7) = a + 12 the value of a | 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

$$21 - 3 ( a - 7 ) = a + 12$$