а) 5х-17=13-х
5x + x = 13 + 17
6x = 30
x = 5
б)4х-9(х-7)= -12
x – 9x + 63 = – 12
x – 9x = – 12 – 63
-8x = -75
x = 9.375
в)15х-(3х-(19-18х))+3х=х+90+2х
раскроем скобки
15x-3x+19-18x+3x = x+90+2x
-6x-71 = 0
6x+71 = 0
6x = -71
x = -71/6
х=-11,8333333333
а) 5х-17=13-х
5x + x = 13 + 17
6x = 30
x = 5
б)4х-9(х-7)= -12
x – 9x + 63 = – 12
x – 9x = – 12 – 63
-8x = -75
x = 9.375
в)15х-(3х-(19-18х))+3х=х+90+2х
раскроем скобки
15x-3x+19-18x+3x = x+90+2x
-6x-71 = 0
6x+71 = 0
6x = -71
x = -71/6
х=-11,8333333333