If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
2*a-1 = a+7/a+1 // - a+7/a+1
2*a-a-(7/a)-1-1 = 0
2*a-a-7*a^-1-1-1 = 0
1*a^1-7*a^-1-2*a^0 = 0
(1*a^2-2*a^1-7*a^0)/(a^1) = 0 // * a^2
a^1*(1*a^2-2*a^1-7*a^0) = 0
a^1
a^2-2*a-7 = 0
a^2-2*a-7 = 0
DELTA = (-2)^2-(-7*1*4)
DELTA = 32
DELTA > 0
a = (32^(1/2)+2)/(1*2) or a = (2-32^(1/2))/(1*2)
a = (4*2^(1/2)+2)/2 or a = (2-4*2^(1/2))/2
a in { (2-4*2^(1/2))/2, (4*2^(1/2)+2)/2}
a in { (2-4*2^(1/2))/2, (4*2^(1/2)+2)/2 }
| -4/5x+5=1311/245+3/7x | | -37v+29v+-10v-18=18 | | (2a-1)=(a+7)/(a+1) | | -37v+-29v+-10v-18=18 | | (29-x)/4=x+5 | | 6g+10g-2g+11g=50 | | (29+c)/4=10 | | (28.71/5.31)=(x/5.9) | | (27y/28)-8=9-(4y/7) | | (27)1/3+8y=25 | | (2580+2920+x)/3=3000 | | (25/x)+(4x/5)=2x-1 | | (25/100)x=(40/100) | | 19s+-49s=-30 | | (25-5)/4=e | | (25+x)/(250+x)=20/100 | | (25+15+18+p)/4=20 | | (25+15+18)+p/4=20 | | 2z-z-z+3z-2z=10 | | (24x-8)/(2x-3)*(2x+3)=0 | | (24/y)*y+2*(24/y)+3y=0 | | (24/x)+2=6 | | 20u-4u-12u-2u+2=14 | | (24/3m)+4=40/m | | (24/2x-6)+(1/x-3)=13 | | (24.6+3a)/4=9.54 | | (24-w)/w=3w-8 | | x-12+x^2-4=3 | | (24)/(2x+6)+(1)/(x-3)=13/2 | | x+9/5+x-2/4=7/4 | | (2387-350x)/30+50x=341 | | (23/56)x=1 |