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Rezolvati ecuatia 120+5ori [28-3ori(2X-140:170[)=140

Răspuns :

= 5•[28-3•(2x-140:170)]=140-120
= 5•[28-3•(2x-140:170)]=20
= 28-3•(2x-140:170)=20:5
=28-3•(2x-140:170)=4
= 3•(2x-140:170)=28-4
= 3•(2x-140:170)=24
= 2x-140:170=24:3
= 2x-140:170=8
=2x-140=8•170
=2x-140= 1360
=2x= 1360+140
=2x=1500
X=1500:2
X=750