Question

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Answer 1

aducem la numitorul comun = > 20 

10(x+1) + 5(x+1) + 4(x+1) = 20 
(x+1) ( 10+5+4) = 20 
( x+1 ) * 19 = 20 
x + 1 = 20/19 
x = 20/19 - 1 
x = 1/19 

Answer 2

[tex]\displaystyle \frac{x+1}2+ \frac{x+1}4+ \frac{x+1}5=1\\ \\ Inmultim~partile~cu~c.m.m.m.c~al~2,4,5~pentru~a~scapa~de~fractie\\ \\ C.m.m.m.c~(2,4,5)=20\\ \\ Dupa~inmultire:\\ \\ 10\times(x+1)+5\times(x+1)+4\times(x+1)=20\\ \\ 10\times x+10+5\times x+5+4\times x+4=20\\ \\ 19\times x+19=20\\ \\ 19\times x=1\\ \\ x=\frac 1{19}\\ \\ S=\{ \frac{1}{19} \}[/tex]