If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
(4*x^2)/0.38-x = 0.671 // - 0.671
(4*x^2)/0.38-x-0.671 = 0
10.52631579*x^2-x-0.671 = 0
DELTA = (-1)^2-(-0.671*4*10.52631579)
DELTA = 29.25263158036
DELTA > 0
x = (29.25263158036^(1/2)+1)/(2*10.52631579) or x = (1-29.25263158036^(1/2))/(2*10.52631579)
x = 0.0475*(29.25263158036^(1/2)+1) or x = 0.0475*(1-29.25263158036^(1/2))
x in { 0.0475*(1-29.25263158036^(1/2)), 0.0475*(29.25263158036^(1/2)+1) }
| -8x-8=34-x | | 5y-3/4+5=13 | | -2(8+4x)=(8+3x) | | 2x^2-13x+27=0 | | m(6m+3)= | | 10x^2+35x-75=0 | | 4(7-5)= | | 3m+-6=9 | | S+4=-6 | | U=55(6)+217 | | U=55n+217 | | 12=0.75x+1.35x | | 23-5y=23+5y | | -50t^2+100t=0 | | 16x+48= | | 3(5x-1)=4(3x+6) | | 5m+4=3-4(m+2) | | 2x-1/2=4-3x | | 3t-8=4t+8 | | 4x+2x+3x+2=3(6) | | 2-m=5 | | n=-4n+25 | | -50t^2+100=0 | | 4x+2x+3x+2=18 | | (37/30-x):25/3=x:4 | | 3t-8=4(t-z) | | -50t+100t=0 | | U=14n+231+9n+9 | | 24(18-22)= | | 876x+23x+43+43=9000 | | X=16+8y | | 4y+2xy=0 |