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2x=56
x=56/2
x=28
b) 15x - 23 = 9 - x
15x+x=9+23
16x=32
x=32/16
x=2
c) - 14x - 7 = 77
-14x=77-7
-14x=70
x=70/-14
x=-5
d) - 11x + 12 =14x
-11x+14x=12
3x=12
x=12/3
x=4
e) 7x + (-10) + 18x - 5x = 25x + 90
7x +10+ 18x - 5x = 25x + 90
20x-10=25x+90
20x-25x=90+10
-5x=100
x=100/-5
x=-20
f) - 36x + 105 - 72x + 7x = 45 - 51x
-101x+105=45 - 51x
-101x+51x=-105+45
-50x=-60(*-1)
50x=60
x=60/50
x=6/5
espero que te sirva suerte y saludos