Question

7a+b=2
3
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Answer 1

$7a+b=2$

$b=2 - 7a$

$7a = 2 - b$

$a = \frac{2}{7} - \frac{1}{7} b$

$Ответ:b = 2 - 7a ;a = \frac{2}{7} - \frac{1}{7} b$