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)
20 = x*((2*x+14)/16) // - x*((2*x+14)/16)
20-(x*((2*x+14)/16)) = 0
(-1*x*(2*x+14))/16+20 = 0
(-1*x*(2*x+14))/16+(16*20)/16 = 0
16*20-1*x*(2*x+14) = 0
320-2*x^2-14*x = 0
320-2*x^2-14*x = 0
2*(160-x^2-7*x) = 0
160-x^2-7*x = 0
DELTA = (-7)^2-(-1*4*160)
DELTA = 689
DELTA > 0
x = (689^(1/2)+7)/(-1*2) or x = (7-689^(1/2))/(-1*2)
x = (689^(1/2)+7)/(-2) or x = (7-689^(1/2))/(-2)
2*(x-((689^(1/2)+7)/(-2)))*(x-((7-689^(1/2))/(-2))) = 0
(2*(x-((689^(1/2)+7)/(-2)))*(x-((7-689^(1/2))/(-2))))/16 = 0
(2*(x-((689^(1/2)+7)/(-2)))*(x-((7-689^(1/2))/(-2))))/16 = 0 // * 16
2*(x-((689^(1/2)+7)/(-2)))*(x-((7-689^(1/2))/(-2))) = 0
( x-((689^(1/2)+7)/(-2)) )
x-((689^(1/2)+7)/(-2)) = 0 // + (689^(1/2)+7)/(-2)
x = (689^(1/2)+7)/(-2)
( x-((7-689^(1/2))/(-2)) )
x-((7-689^(1/2))/(-2)) = 0 // + (7-689^(1/2))/(-2)
x = (7-689^(1/2))/(-2)
x in { (689^(1/2)+7)/(-2), (7-689^(1/2))/(-2) }
| -13+11=-2(x+5) | | 5(2w+6)=20w | | 7.714285714=3.5m+m | | 11,5=(2x+14)/16x | | 10+(-8)+(12-(-4))/3(1-4) | | 55=4-9 | | 2x+18+2x=90 | | 11,5=(13x+139)/13x | | 240=5(5x-12) | | 35/x+5=7/2 | | 6x-2=16-102 | | 12x^2+40+32=0 | | 6=Ts+3.28 | | 4x+10=7x+24 | | 35/x+3=7/2 | | x(5x+1)=21x+45 | | -348=-6(9x-5) | | 17y-14y=6 | | 14x+1=30 | | 7g=3 | | x=5x+14 | | 8x-11+79=180 | | 310=-5(7x-13) | | 3xsquared-10x-8=0 | | 4(2x+1)=4x-6x | | 190x+80(3x)=3440 | | 5y-3=2y+15 | | -3.4x+18-1.1x=9 | | x^4-2x^3-116x^2-8x-480=0 | | 3(n-1)-2=(n-4)-(n-11) | | g(x)=-8(-3x+4) | | x+21= |