Răspuns :
(75-b+5x6)-(63-5x8)=5X10+40:8
(75-b+5x6)-(63-5x8)=55
(75-b+30)-23=55
105-b=55+23
b=105-88
b=17
(75-b+5x6)-(63-5x8)=55
(75-b+30)-23=55
105-b=55+23
b=105-88
b=17
(75-b+30)-(63-40)=55
(75-b+30)-23=55
(75-b+30)=55+23
105-b=78
105-78=b
b=27
(75-b+30)-23=55
(75-b+30)=55+23
105-b=78
105-78=b
b=27