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2014-07-22T19:59:13+03:00
 \frac{x+1}{12}= \frac{5}{3} ⇒x+1=12*5:3⇒x+1=60:3⇒x+1=20
⇒x=20-1⇒x=19
2014-07-22T20:00:16+03:00
(x+1)/12=5/3

3(x+1)=12*5

3x+3=60

3x=60-3

3x=57

x=19