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X =[(30+5:5)x10-24]:7

Răspuns :

X =[(30+5:5)x10-24]:7
X =[(30+1)x10-24]:7
X =(31x10-24):7
X =(310-24):7
X =286:7
x=40.85
[(30+5:5)x10-24]:7 = 
[ (30 + 1) x 10 - 24] :7 =
 [ 31 x 10 - 24] : 7 = 
[ 310 - 24 ] : 7 = 
286 : 7 =
286/7 

x = 40 rest 6  sau 286/7