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2014-09-22T14:21:55+03:00
3x-5=55⇒3x=55+5⇒3x=60 ⇒x=60÷3⇒x=20
100+2y=164⇒2y=164-100⇒2y=64 ⇒y=64÷2⇒y=32
(z-1)×7+1=15⇒7z-7+1=15⇒7z-6=15⇒7z=15+6⇒7z=21⇒z=21÷7⇒z=3
(x+y-1)÷z=(20+32-1)÷3=51÷3=17
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