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)
7*(6-7*k) = 42 // - 42
7*(6-7*k)-42 = 0
7*(6-7*k)-42 = 0
-49*k = 0
-49*k = 0
-49*k = 0 // : -49
k = 0
k = 0
| 5(-1-6n)=-215 | | 6(-4+m)=-12 | | 3(-8+4a)=-24 | | 6(9-4w)=54 | | 7(5b+3)=-364 | | 3(2t+7)=81 | | 3(5+2m)=75 | | 5(-2-6a)=-100 | | 8x^4+2x^6-10x^3=0 | | 7(1+2k)=161 | | 2(1b-3)=4 | | 6(3-a)=-6 | | 3(7+6t)=237 | | 2(-2t+6)=48 | | 5z^2+13z-6=0 | | 12b^2-22b=4 | | 7x+4=8x+5 | | (x-10)-(8x-7)= | | 3x^2+12x+20=11 | | 7(1-2d)=7 | | 5(4x+8)=-140 | | 3x^2/4=27 | | 3(-6m+4)=210 | | 6(1+4n)=222 | | t=t+3.14 | | -9(6)+8(7)=27 | | 6(7k-4)=-66 | | 2(5n-8)=-6 | | 7x+4=110 | | w-3.7=4.43 | | 37y=4(9y-6) | | x^2+8(x+2)=0 |