If it's not what You are looking for type in the equation solver your own equation and let us solve it.
n in (-oo:+oo)
(2/5)*n-18 = 0
2/5*n-18 = 0 // + 18
2/5*n = 18 // : 2/5
n = 18/2/5
n = 45
n = 45
| 7(p+1)=-35 | | -6n^6*7n^2= | | 4(x-2)=4x-10 | | H(t)=-6t^2+40t | | 18+3x+4x-6=31 | | 3-4/(4y-3)=23/(4y-3) | | n-84=139 | | x^2-(2/3)x-1=0 | | 2n-7+1=0 | | -3(-4x+7)=-21 | | 3x+.25x+2+.333x=260 | | 8/x=40/25 | | 3(x^3)-4(x^2)-30x+52=0 | | 3x+.25x+.33x+2=260 | | x^2+x=45 | | 5m+mp+2p+pm= | | 3(x+1)+2x=23 | | 6x^2y+3x^2z+9xz^3=0 | | -3(4m-5)-m=119 | | 425x+255x+17x+48x+8x+x=26390 | | 210+3x=187+4.5x | | 3x^2-800+445000= | | 21x-3y=-18 | | 3(6x-2)=-60 | | -x+6y=9 | | 2(x+2)=5-5x | | 19x-3=14x-28 | | 15t+6-8t+15= | | -0.7x+9.51=-0.5x+6.51 | | 25/75=x/100 | | 1.5(x+4)=6.75 | | 14/15-5/12= |