If it's not what You are looking for type in the equation solver your own equation and let us solve it.
Z in (-oo:+oo)
Z = (16-20)/2.1 // - (16-20)/2.1
Z-((16-20)/2.1) = 0
Z-0.47619048*(16-20) = 0
Z+1.90476192 = 0 // - 1.90476192
Z = -1.90476192
Z = -1.90476192
| 4x-4-x=5x | | 12=-4(t)+284 | | x^2-3t=28 | | c=3-2d | | 4x+-4=8 | | 46.30=v+33.3 | | 2x+2(x+110)=1470 | | 104=2(L+12W) | | 5-3(6+-2)=2(7-9) | | x^4+20x^3+100x^2-x=0 | | 876=594(r)+282 | | 12m+8-5m+2+m=6m+6 | | x^4+20x^3+100x^2-1=0 | | 0=-16t^2+131t+84 | | 873=594r+282 | | 13-(3m+6)=4+2m-12 | | (4x^5/12y^2)^3 | | 13x-15=24 | | 22(10x+5y)=200 | | t+2z=12 | | 10=-2g+14 | | 29=3d+8 | | 5=x+2-2x | | d=-56(6)+594 | | -14=2(1+8k) | | 7x^2+37x+30=0 | | X+5-5=-8 | | -y^2+8y=-7 | | x+2*0=6 | | 2(y-4)-6y= | | 65=-12d+77 | | -10=2+4+2x |