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 = (k+7)/3 // - (k+7)/3
-((k+7)/3)-4 = 0
(-1*(k+7))/3-4 = 0
(-1*(k+7))/3+(-4*3)/3 = 0
-1*(k+7)-4*3 = 0
-k-19 = 0
(-k-19)/3 = 0
(-k-19)/3 = 0 // * 3
-k-19 = 0
-k-19 = 0 // + 19
-k = 19 // * -1
k = -19
k = -19
| (b+36)(b+25)=0 | | 6/8=21/x | | 75-9x=47 | | -2(5-n)+4=6 | | 8x-2x+60=8x+40 | | 5z+5/6=6z+7/6 | | 75.60*.1p=75.60 | | 1/2x+5y=6 | | 300/5 | | 2y+y=7 | | 3x+30y=36 | | -3x+7=6-(5x+8) | | 75.60+.1p=75.60 | | (15p-9q-7r)-(8p+7q-3r)=0 | | -3p+7=5-(11p+3) | | 1s/2+8=54 | | 4(x-9)=3(x+3) | | x+2x=503 | | 5(4-3x)=7(3-4x) | | 8x+4x-38=57-7x | | P^4-10p^2+21=0 | | 2x+4=3(2x-8) | | 5y/2-9=2v/3+2 | | 5x+4(3x-4)=10-9x | | 4x+9-3x=13 | | 12=-4(-6x-5) | | -5+3x=20+2x | | 2.45-3.1z=21.05 | | (x+3)/3x+(2x+2)/4x=17/12 | | 14=6+v/2 | | 6.8-4.2y=5.6y-3 | | 71/2=x+3 |