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)
3*x^5-((45/3)*r^2) = 0
3*x^5-15*r^2 = 0
3*x^5 = -(-15*r^2) // : 3
x^5 = 5*r^2
x^5 = 5*r^2 // ^ 1/5
x = 5^(1/5)*r^(2/5)
x = 5^(1/5)*r^(2/5)
| 3x^2+12xy+3y^2+6x+6y+3=0 | | 668=20x/3+4/3 | | (a-8)(a+8)=0 | | 3/4n=1/4 | | 4x-1.5=3.2 | | 668=20x+4/3 | | 7+5x=3x+26 | | 251-7x=38x+16 | | 65-36/3 | | 90=-30t^2+120t | | 2/5n=1/15 | | -9d-24=-3(d+8)-6a | | 8/15=6/7y | | 2x+4(2)=18 | | 5x-1=2x+14 | | -5x+10=4-10x | | 4y+3=3y+(9-2y) | | 38=4-10x | | 108-4x=3x+22 | | 4/7r=2/9 | | 9x^2-1=3 | | 6x-27=20+13x | | 129+0.25=216.50 | | 6x-2=-8x-24 | | 3(5x+5)=-2(4x+8) | | -3-5x=3x-20 | | -2x+1=x+4 | | 1/2y-7=9 | | 4x-3=7x-16 | | x/2+10=15 | | 23=(-2.5x+5)-4x | | 4y=1-y |