If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
y-3 = (-1/2)*(x-12) // - (-1/2)*(x-12)
y-((-1/2)*(x-12))-3 = 0
(1/2)*(x-12)+y-3 = 0
1/2*(x-12)+y-3 = 0
1/2*(x-12)+y-3 = 0
1/2*x+y-6-3 = 0
1/2*x+y-9 = 0
1/2*x+y-9 = 0
1/2*x+y-9 = 0 // - y-9
1/2*x = -(y-9) // : 1/2
x = (-(y-9))/1/2
x = 2*(9-y)
x = 2*(9-y)
| 1.8r+9=-5.7r+-6 | | -7.87+0.23x= | | -6x-14=-2 | | F+-3=-9 | | 2(x+7)=3 | | -8x=76 | | 9x=8x-12 | | x/2+3=2x/3+1/6 | | 13x+9-5x=73 | | 19=21+x | | 2x(5y-3x)+10y-25=n | | x/7+11=1 | | 19+4c=0 | | -5x+12=-13 | | -5+7=-38 | | 0.3(2n-5)=11-0.65n | | 2+3lnx=8 | | 0.13x-3.4=0.08t-0.2 | | 0.13x-3.4=0.08-0.4 | | 4-2x/3=10 | | 1/2x+1/4x=7/8x | | x+7=-38 | | (B1+b2)h/2 | | 9x=7x+25 | | 5x/3-8=7 | | 7w+2=23-2g | | 12=96/2t | | 4x+107=11x-12 | | ln(x/x^2-1) | | 15n+85= | | x/15-1/5=3/5 | | 10=0.3-9.1 |