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)
x-((2/5)*x)-((2/5)*x)-5 = 15 // - 15
x-((2/5)*x)-((2/5)*x)-15-5 = 0
x+(-2/5)*x+(-2/5)*x-15-5 = 0
1/5*x-20 = 0 // + 20
1/5*x = 20 // : 1/5
x = 20/1/5
x = 100
x = 100
| -6r^2=-276 | | 8m+3n-2m=7n | | -6x^2=126 | | y+1.05=7.36 | | 3x1/10 | | y^2+4=12 | | 10h^2+17h+3=0 | | 5x^2+7=-60 | | x+y=-35 | | 40x-20x=3 | | 1b+4=-1 | | x-2/3x-8=35 | | x^3-3x^2+7x-5=0 | | 20-5(p+1)=-(2p-15) | | -6r+63-r=7(9-r) | | 3*y=-12 | | 8*c=816 | | -2+6y=2 | | x/-7=15 | | 2+0.25(8x+1)=5x+0.75(4x-1) | | 2x-3=5x+4-3x | | 28=7x^2 | | 5k+3=3k-7 | | 60=15x^2 | | 3a^2-16a+21=0 | | 26x+18y=184 | | Cos^4x-4cos^2x=0 | | 3x-(5x/4)=12 | | X*0.75=9.3 | | 26x+13y=184 | | 5g-6-7-5g= | | 60+10x=180 |