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)
4*(10-(4*k)) = -40 // + 40
4*(10-(4*k))+40 = 0
4*(10-4*k)+40 = 0
4*(10-4*k)+40 = 0
80-16*k = 0
80-16*k = 0
80-16*k = 0 // - 80
-16*k = -80 // : -16
k = -80/(-16)
k = 5
k = 5
| 2x-3/4=x+5/3 | | 2(-4x+3)=22 | | 3(6x-6)=54 | | 3(5k-9)=-207 | | 4(5x+5)=100 | | 7(6w-4)=-490 | | 6(5-2m)=30 | | 3(3+4d)=57 | | 4(5w+8)=-148 | | 7(-1w-3)=-70 | | 5(-5-5b)=-175 | | 6(5m+2)=342 | | 7(-2-4x)=182 | | 7(6+6a)=336 | | 3(-5+4d)=45 | | 2(6n-5)=-94 | | 7(6+5d)=77 | | 3(5w-10)=-150 | | 7(-1-5n)=308 | | 3(9+6k)=225 | | 4(9-3b)=-72 | | 3(-3-3a)=-108 | | 5(-7m+2)=-25 | | 5(9-4t)=-155 | | 7(-7+2t)=-217 | | 4(-3n+8)=104 | | 6(-1k-7)=30 | | 7(-9-4x)=133 | | (3x-4)(7x+1)= | | 3(6w+9)=-153 | | 4(6+7x)=-200 | | 7(9-2a)=-7 |