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Bueno vamos a plantear
A- (x+3).4=108
4x+4.3=108
4x+12=108
4x=108-12
4x=96
X=96/4
X=24
Comprobación
(24+3).4=108
24.4+4.3=108
96+12=108
108=108
B- 4(x-1)=x+17
4x-4=x+17
4x-x=17+4
3x=21
X=21/3
X=7
Comprobación
(7-1).4=7+17
6.4=24
24=24
Listooo espero haberte ayudado ;)