If it's not what You are looking for type in the equation solver your own equation and let us solve it.
c in (-oo:+oo)
(2/5)*c-8 = 4 // - 4
(2/5)*c-8-4 = 0
2/5*c-12 = 0 // + 12
2/5*c = 12 // : 2/5
c = 12/2/5
c = 30
c = 30
| 2x-3x=-17 | | q^2-7q+2=0 | | 0.34*3600= | | 8m^2+6m+1=0 | | 6a^3-65a^2+77a=0 | | -18+x^2+6x=0 | | (-6i)(-8i)= | | 7y^2-6y-9=0 | | 2x^2-200x=0 | | 7a+29=35b+22 | | 7(4a-3)-(2a+1)9=2(a-9) | | 8(x-9)=2(3x-8) | | 9=40+5 | | (2/3)p-4=6 | | 4t^2+2t-5=0 | | 7x=4(x-9)+3 | | y/6-3=1 | | 2622=3800-0.69 | | (-x+10)(-x-14)=0 | | 200m-100m+58500=60000-200m | | x/6-10=7/12 | | 40/38 | | 3s^2-s-9=0 | | -117=-9(x+3) | | 2(-3a+5)=49(a+4) | | 7/8n=35 | | 2a-8+4a=5a+6 | | 38=-6x-x+3 | | 1/2x-9=2 | | 4y-6=-42 | | (2/5)c-8=4 | | (5x-2)+(x^2+8)=90 |