1.

Slove 21 - 3 (a-7) = a + 20​

Answer»

Step-by-step EXPLANATION:

21 - 3(a - 7) = a + 20

18(a - 7) = a + 20

18a - 126 = a + 20

18a - a = 20 + 126

17a = 146

a =  \frac{146}{17}

a = 8.58



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