Решите уравнение x- (1/2x+1/4x+1/7x)=3
(28x)/28 - ((14x)/28 + (7x)/28 + (4x)/28) = 3 (28x - 14x - 7x - 4x)/28 = 3 3x/28 = 3 3x = 28*3 x = 3