If it's not what You are looking for type in the equation solver your own equation and let us solve it.
k in (-oo:+oo)
(5/9)*k = 9/10 // - 9/10
(5/9)*k-(9/10) = 0
(5/9)*k-9/10 = 0
5/9*k-9/10 = 0 // + 9/10
5/9*k = 9/10 // : 5/9
k = 9/10/5/9
k = 81/50
k = 81/50
| 60-57/3.5 | | 7x+142=3+24 | | 21200+x=81200 | | 15x-10(0.4+x)=5 | | 33/49,35/117,27/55 | | 13=8+7/3t | | 2x-5x-10=6 | | 6(z-1)-(4-2z)=7z | | h(5y)=x^2+3x | | 117-5x=13x+21 | | -6x^2+6x+72=0 | | 3x^2y+24xy-99y=0 | | 2x^2+19x+21=0 | | -6x^2+3x^2+72x-5=0 | | 36+-30= | | 2(m+7)-(2-3m)=4m | | -91-9x=7x+12 | | 3/2x+5/2y=20 | | x/-9=-3-(-5) | | x^2-5x+6=2000000 | | x-8.4=-4.3 | | 4.9t^2=2.5 | | 4.9t^2=2.3 | | x(9)+4=58 | | 12x+18=3x+126 | | 52-4x=23x+19 | | 5.5+y=8 | | y=100-2.5x | | 7+y=9 | | (45-5w^2)/(w^2+3w-18) | | 4(5x+2)=42 | | x+1/3+5=x+8/9 |