Помогите с уравнениями.
18) 3/4(4/3х-4)-8(1/4х+3/8). (3/8 и другие - это дроби!)
19) 6(2х+1/6у)-5(2,4х-0,2у). (1/6у - дробь!)
20) -9(2/3а-1/9b)-4(7/2f+3/8b) (2/3 и другие - это дроби!)
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