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x in (-oo:+oo)
x/3 < 0
1/3*x+0 < 0 // - 0
1/3*x < 0 // : 1/3
x < 0/1/3
x < 0
x in (-oo:0)
(-oo:0)
| 24=.0021x^2-0.286x+16.28 | | 7*3-5x+2=25+2x-7x-2 | | 0.2=48 | | 6cos^2(2x)-5cos(2x)+1=0 | | 3/21=2/x | | 3(2x+15)=33 | | -7+n*7=-6 | | 10x+9y=4 | | 9x+33=21x+9 | | 171=215-x | | -x+195=258 | | 4x+3=155 | | -4(7-5)-3= | | 20=3x-13 | | 5x-14=56 | | -4-3(3-4)= | | -7x/4=21 | | 2(2x/3) | | -28=-4/3x | | 3x+14=x-21 | | -312=8(5n+1) | | 3(5+7)-7= | | 4x+3x+7+x= | | x^2+7x+31=1 | | 3-4+5*6-(-4)= | | 2x+6x-7= | | 56x^2=160x+256 | | 7x-3x+9-5= | | 10(c)+100=12(c) | | 19.5(13.3-4.4x)=7.2(0.8x-11.6) | | 29/4+6t=3t/4-1/4(-9t-1) | | 149+h=(15)(13) |