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cum se rezolva: (a x 9 -78 :2) + 4 x 25= 1492

Răspuns :

a x 9 -78:2= 1492 - 100 a x 9- 39 =1392 a x 9 = 1353 a=1353:9 a=150,(3)
(ax9-49)+100=1492
ax9-49=1492-100
ax9-49=1392
ax9=1392+49
ax9=1441
a=1441:9
a=160.11