Question

1)(x+12/21)+6/21=5/21
2)17/30-(x-5/30)=15/30
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Answer 1

1) (x + 12/21) + 6/21 = 5/21
x + 12/21 = 5/21 - 6/21
x + 12/21 = -1/21
x = -1/21 - 12/21
x = -13/21

2) 17/30 - (x - 5/30) = 15/30
17/30 - x + 5/30 = 15/30
17/30 + 5/30 - x = 15/30
22/30 - x = 15/30
-x = 15/30 - 22/30
-x = -7/30
x = 7/30

Answer 2

$1)(x + \frac{12}{21} ) + \frac{6}{21} = \frac{5}{21}$

$x + \frac{12}{21} = \frac{5}{21} - \frac{6}{21}$

$x + \frac{12}{21} = - \frac{1}{21}$

$x = - \frac{1}{21} - \frac{12}{21}$

$x = - \frac{13}{21}$

$2) \frac{17}{30} - (x - \frac{5}{30} ) = \frac{15}{30}$

$- x + \frac{5}{30} = \frac{15}{30} - \frac{17}{30}$

$- x + \frac{5}{30} = - \frac{2}{30}$

$- x = - \frac{2}{30} - \frac{5}{30}$

$- x = - \frac{7}{30}$

$x = \frac{7}{30}$