Solve: $3 a + 5 b = 26 a + 5 b = 22$

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Solution

$3 a + 5 b = 26$ (1)
$a + 5 b = 22$ (2)
Subtracting (2) from (1):
$2 a = 4 ⟹ a = 2$ (3)
Substituting (3) in (2):
$2 + 5 b = 22 ⟹ 5 b = 20 ⟹ b = 4$
$a = 2, b = 4$

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