Tìm x biết:

tìm x biết:

11/   23 + 3x = 56 : 53

12/  461+(x-45)=387

13/  11-(-53+x)=97
14/  -(x+84)+213=-16<!--[if gte vml 1]> <!--[endif]--><!--[if gte mso 9]--><xml> </xml><![endif]-->

15/   125: (3x – 13) = 25

16/  .3(2x + 1) – 19 = 14

 17/   175 – 5(x + 3) = 85

18/ 2(x – 5) – 3(x + 7) = 14

19/   3(x – 4) – (8 – x) = 12

20/    -7(3x – 5) + 2(7x – 14) = 28

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