If it's not what You are looking for type in the equation solver your own equation and let us solve it.
m in (-oo:+oo)
3 = 12-(m/7) // - 12-(m/7)
m/7-12+3 = 0
1/7*m-9 = 0 // + 9
1/7*m = 9 // : 1/7
m = 9/1/7
m = 63
m = 63
| Sec^2x+secx=16 | | x+64=9x | | 60=5u+15 | | 12-4v=2v | | 4x+5x-18=180 | | 5x=x+27 | | 3y+20=x | | 179=86-x | | 4(3a^2-a+6)= | | 41=-y+280 | | 4x+9=5x+72 | | 194-y=137 | | p=x-y/3 | | 5n+6=-9 | | 5(p-64)=90 | | 2x+5+-3=31 | | 4x+24=66 | | x^2+y^2+8x+32y+263=0 | | -6y-6=-5y-7 | | 0.30x+0.05(14-x)=0.10(22) | | (5-9a)2= | | 11+9=-4(4x-5) | | 6(h-90)=30 | | 2x-(3x+5)+2=5x-14 | | 2x+5-3=31 | | 5(2x+9)=-47+72 | | 8=k-7/6 | | 3+4ln(x)=-5 | | 1/3(30b)= | | 4(x-4)+5=4x+1 | | j/4-4=1 | | -4(6y^2)= |