If it's not what You are looking for type in the equation solver your own equation and let us solve it.
r in (-oo:+oo)
3*(r+4)+(16*r)/4-(-2*5*r) = 0
3*(r+4)+(16*r)/4+10*r = 0
3*(r+4)+4*r+10*r = 0
3*(r+4)+4*r+10*r = 0
7*r+10*r+12 = 0
17*r+12 = 0
17*r+12 = 0
17*r+12 = 0 // - 12
17*r = -12 // : 17
r = -12/17
r = -12/17
| 5z-9=6z-6 | | -0.1w-0.1=0.6w+0.6 | | 4u^8x^4y+16u^7y^6= | | 6p-1=3 | | y=300-50x | | 12.3=26.9 | | n(n+1)=182 | | PK^2=52.90 | | (9+w)(5w+1)=0 | | 3k+6(4+-0.5k)=24 | | 25000-2.5x=0 | | 5x+3y=452 | | 2l+2(50)=400 | | 2(7x+4)=4x-6(-x)+7 | | -12+k/-4=8 | | 3(-3+1)= | | 7x+1/8=-1 | | (3y/20)-3=7(-4y/5) | | 0.2x-8=2 | | 6b+3k=24 | | (8a)/(2a) | | 8a/2a | | 4=2(3.14)r | | 3/2-4/5 | | 3-2(-7)-(-7)= | | 3y/20-3=7-4y/5 | | 5g=m(4+g) | | 2x(5x+3)-3(5x+3)= | | 3x+19=-56-10x | | x/2=y | | -6(x+4)-42=5-23 | | 28-x/3=x/4 |