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[tex]a = -2x+ 5[/tex]
[tex]b= x+3[/tex]
[tex]c=3x+2[/tex]
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[tex]a)[/tex] [tex]x=-1[/tex]
[tex]a = -2*(-1) +5 = 2+ 5 = 7[/tex]
[tex]b= - 1 +3 = 2[/tex]
[tex]c=3*(-1)+2=-3+2=-1[/tex]
[tex]a+b+c=7+2-1=8[/tex]
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[tex]b) |a+b|= |c|[/tex]
[tex]|-2x+5+x+3|= |3x+2|[/tex]
[tex]|8-x|=|3x+2| => \left \{ {{8-x=3x+2} \atop {8-x=-3x-2}} \right.[/tex]
[tex]^{ ( 1) }[/tex] [tex]8-x=3x+2 <= > -4x= -6 => x_{1} = \frac{3}{2}[/tex]
[tex]^{(2)}[/tex] [tex]9-x=-3x-2 <=> 2x=-10 => x_{2} =-5[/tex]
[tex]x[/tex] [tex]nu mar[/tex] [tex]intreg[/tex] [tex]=>[/tex] [tex]x=-5[/tex]
