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2014-10-20T20:31:16+03:00
⇒3(10x-1)=5(x+13)
30x-3=5x+65
30x-5x=65+3
25x=68
x=68/25
x=2,72
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2014-10-20T20:34:57+03:00
3*(10x-1)=(x+13)*5
30x-3=5x+65
30x-5x=65+3
25x=68
x=68:25
x=2,72
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