Question

Tìm x biết :

13-(x-5)=3+2x

Answer 1

13 - (x - 5) = 3 + 2x

=> 13 - x + 5 = 3 + 2x

=> 13 - x + 5 - 3 = 2x

=> 13 - x + 2 = 2x

=> 13 + 2 = 2x + x

=> 15 = 3x

=> 3x = 15

=> x = 15 : 3

=> x = 5

Answer 2

13 - (x-5) = 3 + 2x

13 - x + 5 = 3 + 2x

13 -x  = 3-5 + 2x

13 - x = -2 +2x

13 - x + 2 = 2x

13 + 2 = 2x + x

15       = 3x

x         = 15 / 3

x         = 5

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