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36+4×(497÷a-21)÷20=46

Răspuns :

4x(497:a-21):20=46-36
4x(497:a-21)=10x20
497:a-21=200:4
497:a=50+21
a=497:71
a=7


36+4×(497÷a-21)÷20=4636+4×(497÷a-21)x1/20=46
36+(1988-84a)/20a=46
(1988-84a)/20a=10
1988-84a=200a
1988=284a
a=7