If it's not what You are looking for type in the equation solver your own equation and let us solve it.
w in (-oo:+oo)
5*(7-7*w) = 105 // - 105
5*(7-7*w)-105 = 0
5*(7-7*w)-105 = 0
-35*w-70 = 0
-35*w-70 = 0
-35*w-70 = 0 // + 70
-35*w = 70 // : -35
w = 70/(-35)
w = -2
w = -2
| 7(-7+5w)=-399 | | 7(3w+10)=154 | | -6=-1(4-8n)+2n | | 3(-1+5k)=57 | | 7(5a+5)=140 | | 2(3t+7)=14 | | 3(-2+4w)=-42 | | (3y^2-7y+2)*(y^2-8)= | | 20=10(2x-4) | | 0.5x-2.3=3.1x+2.5 | | 6(1x-9)=-54 | | 10=(2x-4) | | 6(-7-4n)=222 | | 7(4-6b)=-14 | | 4(2k-8)=-24 | | 0.50x+0.35(30)=25.5 | | 0.6x+6.4=4.9 | | 4(-4-2m)=-8 | | 5(-5t-7)=140 | | 3(5b+6)=93 | | x^3+2x^2=5x+6 | | 6(7-4t)=42 | | 4(-3n+5)=140 | | 3(6+6b)=-36 | | 1+4x/7+5-x/3=13/21 | | 3(6-7d)=18 | | 6(-10+3x)=120 | | 7(4d+9)=-21 | | 3(7t-6)=87 | | 7(9+3d)=126 | | 4(5k-8)=-272 | | 5(-5+x)=25 |