[tex]8x+30=31/-30\\8x=1/:8\\x=0.125\\\\4x-5=7/+5\\4x = 12/:4\\x=3\\\\18-5x=23/-18\\-5x=5/:-5\\x=-1\\\\12+3x=x+18/-x\\12+2x=18/-12\\2x=6/:2\\x=3\\\\10-2x=19-5x/+2x\\10=19-3x/-19\\-9=-3x/:-3\\3=x\\\\\frac{1}{4} +\frac{2}{3}x=\frac{1}{3} x-\frac{3}{4} /-\frac{1}{4} \\\\\frac{2}{3} x=\frac{1}{3} x-\frac{2}{4} /-\frac{1}{3} x\\\\\frac{1}{3} x=\frac{2}{4}/*3 \\\\x=1\frac{1}{2}[/tex]
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