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Răspuns:
(a+365)=1000:2
(a+365)=500
a=500-365
a=135
(a-29)=160x4
(a-29)=640
a=640+29
a=669
(a+3×2)=50x5
(a+3×2)=250
(a+3)=250×2
(a+3)=500
a=500+3
a=503
(70-a×7)=7×7
(70-a×7)=49
(70-a)=49:7
(70-a)=7
a=70-7
s=63