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2014-10-14T21:49:41+03:00
(x+3)*5+3=28
5x+15+3=28
5x+18=28
5x=28-18
5x=10
x=10:5
x=2
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2014-10-14T21:51:44+03:00
(x + 3) *5+3=28
(x+3)*5 =28-3
(x+3)*5=25
(x+3)=25:5
(x+3)=5
x+3=5
x=5-3
x=2