а) 14х = -42
х= -3
b)2х – 16 = 0
2х=16
х=8
c)8х= 23+17
8х= 40
х=5
d)5x= 210+12x
5x-12x=210
-7x=210
x=-30
e) 5x+21=3x+25
5x-3x=25-21
2x=4
x=2
f)17-3x+7x=31-2x+10
-3x+7x+2x=31+10-17
6x=24
x = 4
g)2x-12=2(10-7x)
2x-12=20-14x
2x+14x=20+12
16x=32
x=2
h)5x-12-2(x-1)=3(5-2x)+4x
5x-12-2x-2=15-6x+4
5x-2x+6x=15+4+12+2
9x=33
x=3.6
a)14+x=2
x=
e)x+21=3-5x
x+5x=3-21
6x=-18
x=-3
b)2x+x-16=2
2x+x=2+16
3x=18
x=6
f)17x-3+x=12-2x+5
17x+x+2x=12+5+3
20x=20
x=1
c)8-17x=25
-17x=25-8
-17x=17
x=-1
g)2(x-12)=210-7x
2x-24=210-7x
2x+7x=210+24
9x=234
x=26
d)5-x=20+2x
-x-2x=20-5
-3x=15
x=-5
h)(5x-1)2-2x-3=35-3(2x+4)
10x-2-2x-3=35-6x-12
10x-2x+6x=35-12+2+3
14x=18
x=1.28
вот и все))