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812 : ( 63 : 9 ) × 8 – [(250 x 2 + 3 x @ ) – 13 x 12 ] + 716 : 4 = 463​

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Crintina72ask

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812:(63:9)×8-[(250×2+3×a)-13×12]+716:4=463

812:7×8-[(500+3×a)-156]+179=463

116×8-[(500+3×a)-156]=463-179

928-[(500+3×a)-156]=284

[(500+3×a)-156]=928-284

[(500+3×a)-156]=644

(500+3×a)=644+156

(500+3×a)=800

3×a=800-500

3×a=300

a=300:3

a=100

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