Explicație pas cu pas:
a+b-c=75
(12×a)+(12×b)-(12×c)= 12a+12b-12c
12(a+b-c)
12×75= 900
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Explicație pas cu pas:
a+b-c=75
(12×a)+(12×b)-(12×c)= 12a+12b-12c
12(a+b-c)
12×75= 900