Răspuns:
Explicație pas cu pas:
a) 3x+5=2|-5
3x=-3|:3
x=(-1)
b) 5x+3(x+6)=7x+13
5x+3x+18=7x+13
8x+18=7x+13|-8x
18=-x+13|-13
5=-x
-x=5
x=-5
c) [tex]4x-\frac{9}{3} +3x-\frac{40}{9} =2x+\frac{5}{6} +1\frac{5}{18}[/tex]
[tex]4x+3x-3-\frac{40}{9} =2x+\frac{15}{18} +\frac{23}{18} \\\\7x-\frac{27}{9} -\frac{40}{9} =2x+\frac{38}{18}[/tex]
[tex]7x-\frac{67}{9} =2x+\frac{38}{18} \\\\7x-2x=\frac{67}{9} +\frac{38}{18} \\\\5x=\frac{134}{18} +\frac{38}{18}\\\\5x=\frac{172}{18} |:5\\\\x=\frac{\frac{172}{18} }{5} \\[/tex]
[tex]x= 1.9(1)[/tex]
[tex]x=\frac{86}{45}[/tex]
Succes! :)