a) 7x = 91x = 13
б) 1.4 - 0.8 = 0.6
в) 1/2x - 1/3 = 1/61/2x = 1/6 + 1/31/2x = 1/6 + 2/61/2x = 3/61/2x = 1/2x = 1
г) 17.5x = 35x = 35 / 17.5x = 2
a) 7x = 91
x = 13
б) 1.4 - 0.8 = 0.6
в) 1/2x - 1/3 = 1/6
1/2x = 1/6 + 1/3
1/2x = 1/6 + 2/6
1/2x = 3/6
1/2x = 1/2
x = 1
г) 17.5x = 35
x = 35 / 17.5
x = 2