[tex]1)\;-21-x=-8x\\-x+8x=21\\7x=21\\x=21:7\\x=3.[/tex]
[tex]2)\; 10x-3=17x+25\\10x-17x=25+3\\-7x=28\\x=28:(-7)\\x=-4.[/tex]
[tex]3)\;0,4x-2,3=-1,6x+0,7\\0,4x+1,6x=0,7+2,3\\2x=3\\x=3:2\\x=1,5.[/tex]
[tex]4)\;x-4=\frac{2}{9} x+\frac{5}{18}\; \\x-4=\frac{2}{9} x+\frac{5}{18}\;|*18\\18x-72=4x+5\\18x-4x=5+72\\14x=77\\x=77:14\\x=5,5.[/tex]
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[tex]1)\;-21-x=-8x\\-x+8x=21\\7x=21\\x=21:7\\x=3.[/tex]
[tex]2)\; 10x-3=17x+25\\10x-17x=25+3\\-7x=28\\x=28:(-7)\\x=-4.[/tex]
[tex]3)\;0,4x-2,3=-1,6x+0,7\\0,4x+1,6x=0,7+2,3\\2x=3\\x=3:2\\x=1,5.[/tex]
[tex]4)\;x-4=\frac{2}{9} x+\frac{5}{18}\; \\x-4=\frac{2}{9} x+\frac{5}{18}\;|*18\\18x-72=4x+5\\18x-4x=5+72\\14x=77\\x=77:14\\x=5,5.[/tex]