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#1
[tex]\sf \longmapsto \: x - 3 = x + 5[/tex]
[tex]\sf \longmapsto \: 1x - 1x = 5 + 3[/tex]
[tex]\sf \longmapsto \: 0 = 8[/tex]
#2
[tex]\sf \longmapsto \: x - 3 = 2x (5)[/tex]
[tex]\sf \longmapsto \: x - 2x = 10x[/tex]
[tex]\sf \longmapsto \: x−3−10x=10x−10x[/tex]
[tex]\sf \longmapsto \: −9x−3=0[/tex]
[tex]\sf \longmapsto \: −9x−3+3=0+3[/tex]
[tex]\sf \longmapsto - 9x = 3[/tex]
[tex]\sf \longmapsto \: x = \dfrac{ - 9x}{ - 9} = \dfrac{ 3}{ - 9} [/tex]
[tex]\sf \longmapsto \: x = \dfrac{ - 1}{3} [/tex]