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4[2(2x+1)-5] - 685 = 23

Răspuns :

Salut,

4[2(2x+1)-5]-685 = 23
4(4x+2-5) = 23+685
4(4x-3) = 708
16x-12 = 708
16x = 708+12
16x = 720
x = 720:16
x = 45.


Succes! :3
4*[2*(2x+1)-5]-685=23
4*[2*(2*x+1)-5]-685-(23)=0
((4*(2*(2x+1)-5))-685)-23=0
(4*(4x-3)-685)-23=0
16x-720=16*(x-45)
16*(x-45)=0
16=0
x-45=0
x=45