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)
(-2/5)*k-(2*(k+3)) = 6/5 // - 6/5
(-2/5)*k-(2*(k+3))-(6/5) = 0
(-2/5)*k-2*(k+3)-6/5 = 0
(-2*k)/5-2*(k+3)-6/5 = 0
(-2*5*(k+3))/5+(-2*k)/5-6/5 = 0
-2*5*(k+3)-2*k-6 = 0
-12*k-30-6 = 0
-12*k-36 = 0
(-12*k-36)/5 = 0
(-12*k-36)/5 = 0 // * 5
-12*k-36 = 0
-12*k-36 = 0 // + 36
-12*k = 36 // : -12
k = 36/(-12)
k = -3
k = -3
| b/12=-26 | | 2w+2(w+4.75)=133.5 | | 3(1q+-5)=2(1q+5) | | -29n=-377 | | (1/2)(6x+18)=3(x+3) | | -9(z-7)= | | 23+x=-23 | | 2x-3/2-x+7/9=3x-11/9 | | x^2100=0 | | 300-2x-0.01x^2=0 | | x^2-37/6x+19/2=0 | | 1/5+9/7m=492/35 | | 1n-10=5/6n-7-1/3m | | 6z+8=4z | | -4(3+-2x)+2x=2x-8 | | 2x-1/2-3x-1/3=4x-9 | | 7g=7+6g | | -(3-x)=4 | | -9/-6 | | 2-2/1= | | 10x-78=6x-14 | | -(8+x)+5-5x= | | 5y^2/(30y+y^2) | | 2+3x-2x=-15 | | rx+sovert=1 | | 5y/6+x=1-3y/2 | | 8c^2/d^3 | | 5/12-1/2x=2/3x-1/6 | | 5y/6+3y/2 | | 4/5x-7/10=5/6x | | 3x+11=2x+15 | | -2x^2-5x+5= |