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3x = 15
x = 5
7x - 5 = 16
7x = 16 + 5
7x = 21
x = 3
x+12=8
x = 8 - 12
x = -4
15x-10=170
15x= 170 + 10
15x = 180
x = 12
2x+14=16
2x = 16 - 14
2x= 2
x=1
3x-5=4+x
3x - x = 4 + 5
2x = 9
x = 9/2
11x-1=121
11x = 121 + 1
11x = 122
x = 122/11
3x-2=2x
3x -2x = 2
x = 2
5x+3=2x+15
5x - 2x = 15 - 3
3x = 12
x= 4
16x-3=102-5x
16x + 5x = 102 + 3
21x = 105
x = 5
7-3(x-2)=(7-x)4-4x
7 - 3x+ 6 = 28 - 4x - 4x
13 - 3x = 28 - 8x
8x - 3x = 28 - 13
5x = 15
x = 3
3x-(7-2x)=6-2(1-2x)
3x - 7 + 2x = 6 - 2 + 2x
5x - 7 = 4 + 2x
5x - 2x = 4 + 7
3x = 11
x = 11/3
Espero que te ayude =)
3x=11+4
3x=15
x=15÷3
x=5
b) 7x-5=16
7x=16+5
7x=21
x=21÷7
x=3
c) x+12=8
x=8-12
x=-4
d) 15x-10=170
15x=170+10
15x=180
x=180÷15
x=12
e) 2x+14=16
2x=16-14
2x=2
x=2÷2
x=1
f) 3x-5=4+x
3x-x=4+5
2x=9
x=9÷2
x=4,5
g) 11x-1=121
11x=121+1
11x=122
x=122÷11
x=11,09091
h) 3x-2=2x
3x-2x=2
1x=2
x=2÷1
x=2
i) 5x+3=2x+15
5x-2x=15-3
3x=12
x=12÷3
x=4
j) 16x-3=102-5x
16x+5x=102+3
21x=105
x=105÷21
x = 5
k) 7-3(x-2)=(7-x)4-4x
7-3x+6=28-4x-4x
13-3x=28-8x
8x-3x=28-13
5x=15
x=15÷3
x=5
l) 3x-(7-2x)=6-2(1-2x)
3x-7+2x=6-2+2x
5x-7=4+2x
5x-2x=4+7
3x=11
x=11÷3
x=3,66667
esta es la respuesta