[tex]1) \\\\0.8(2x-1)+0.3(4-5x)=0\\1.6x-0.8+1.2-1.5x=0\\0.1x+0.4=0\\0.1x=-0.4 /:(0.1)\\x=-4[/tex]
[tex]2)\\-0.7(3x-8)-5(0.4-2x)=2(3.8x+2.2)\\-2.1x+5.6-2+10x=7.6x+4.4\\-2.1x+10x-7.6x=4.4-5.6+2\\0.3x=-1.2+2\\\frac3{10}x=\frac8{10} /*(\frac{10}3)\\x=\frac8{10}*\frac{10}3\\x=\frac83[/tex]
[tex]3)\\\frac{x-1}2-\frac{x-2}4-\frac{x-4}8+1=\frac{15-5x}4+2x\\\frac{4(x-1)}{8}-\frac{2(x-2)}{8}-\frac{x-4}8+\frac88=\frac{2(15-5x)}{8}+\frac{16x}{8}\\4x-4-(2x-4)-(x-4)+8=30-10x+16x\\4x-4-2x+4-x+4+8=30+6x\\x-6x=30+4-4-4-8\\-5x=18 /:(-5)\\x=-\frac{18}5[/tex]
[tex]4) \\3(3(3x-4)-4)-7=-2(-2(-2x+5)+5)+5\\3(9x-12-4)-7=-2(4x-10+5)+5\\3(9x-16)-7=-2(4x-5)+5\\27x-48-7=-8x+10+5\\27x-55=-8x+15\\27x+8x=15+55\\35x=70 /:35\\x=2[/tex]