If it's not what You are looking for type in the equation solver your own equation and let us solve it.
f in (-oo:+oo)
f/0.8 = -9 // + 9
f/0.8+9 = 0
1.25*f+9 = 0 // - 9
1.25*f = -9 // : 1.25
f = -9/1.25
f = -7.2
f = -7.2
| 10s=8s+10 | | 3.3m=3.40 | | f(2)=5x^4-5x+10 | | 93=19+2c | | 4g=3g+3 | | 83=17-(-2y) | | -14=-(31+p) | | 8z=6+7z | | f(-1)=5x^4-5x+10 | | 10(x-3)=5x-80 | | 3x+x-3+5x+12=180 | | x^2+7x-35=2x+1 | | 3+7m=10m | | z-19=-16 | | w-17.3=-7.6 | | 5(2-4b)+6=(5-b)-(4b-6) | | s=2.6in | | 4f+9=29 | | 20y=360 | | k-13.5=2.5 | | 16x+26=74 | | -2(7x-5)=-14x+10 | | x-51=48 | | y-8/6=y/2 | | 5.9=t+1 | | 8y=-9x-12 | | y-10=1 | | x^2-3x+15=4x+5 | | 0=-2/5x-10 | | x^2-4+4x-2=90 | | 25b-6b=55 | | a/2 |