Question

slove 21 - 3 (a-7) = a + 20​

Answer 1

Step-by-step explanation:

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

$18(a - 7) = a + 20$

$18a - 126 = a + 20$

$18a - a = 20 + 126$

$17a = 146$

$a = \frac{146}{17}$

$a = 8.58$

Answer 2

SOLUTION

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