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01. x+40= 3x
40= 3x-x
40=2x
40/2=x
20=x
02. 2x+25=105
2x= 105-25
2x=80
x= 80/2
x= 40
03. 108= 4x-16
108+16= 4x
124=4x
124/4 = x
31=x
04. 2Ф+40=Ф+98
2Ф-Ф= 98-40
Ф=58
05. NO HAY VARIANTE
06. 2α-8=36
2α=36+8
α=44/2
α=22
07. x+20=3x
20=3x-x
20=2x
20/2=x
10=x
08. 60=2α-10
60+10=2α
50/2=α
25=α
Espero te sirva:3