Question

21 - 3 (x - 7) = x + 20
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Answer 1

Step-by-step explanation:

21- 3x+21 = x+20

42-3x= x + 20

4x= 22

x= 11/2

Answer 2

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$21 - 3(x -7 ) = x + 20 \\ 21 - 3x + 21 = x + 20 \\ 42 - 3x = x + 20 \\ - 3x - x = 20 - 42 \\ - 4x = - 22 \\ 4x = 22 \\ x = \frac{22}{4} \\ x = \frac{11}{2}$