Найдите корень уравнения 1-5х = 3(7-х)
1-5х = 3(7-х) 1-5x = 21 - 3x 1-21 = -3x + 5x -20 = 2x x = -10
1-5х=3(7-х) 1-5х=21-3х -20=2х х=-10