Question

solve: 21-3(a-7)=a+20
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Answer 1

= 32.

own answer

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Answer 2

Step-by-step explanation:

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

$21 - 3a + 21 = a + 20$

$21 + 21 - 20 = a + 3a$

$42 - 20 = 4a$

$22 = 4a$

$\frac{22}{4} = a$

$a = \frac{11}{2}$

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