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)
2*x = (1/4)*(90-x) // - (1/4)*(90-x)
2*x-((1/4)*(90-x)) = 0
(-1/4)*(90-x)+2*x = 0
2*x-1/4*(90-x) = 0
2*x-1/4*(90-x) = 0
9/4*x-45/2 = 0
9/4*x-45/2 = 0
9/4*x-45/2 = 0 // + 45/2
9/4*x = 45/2 // : 9/4
x = 45/2/9/4
x = 10
x = 10
| 4/5+3x=58/35 | | 4/7-4/5x=5/21 | | -1+2/3x=-4/9 | | 8-3x=20/3 | | -8-1/2x=-6 | | 1/6(x+2)=2/3 | | -3/5x+1/3=-4/15 | | 2x+5/9=131/9 | | 1/3(x-1)=2 | | 1/4-1/6x=-19/12 | | -4/9-1/2x=-4/9 | | 3/7x+2=-22/7 | | -8.6+r=-6.4 | | 3/7x-2=-53/28 | | 8=x+10 | | 4x-4/7=180/77 | | 1/2x+6=11/2 | | 7x-5=-26 | | -5/7x-1=-6/11 | | -7x+3=-39 | | y-1/2=7 | | 1/2+6x=97/2 | | 4-1/2x=15/2 | | -8/9+3x=-43/18 | | 1/2+5/6x=-7 | | -6x-5/7=-5/7 | | 1/2x+1/3=5/8 | | 14x+27=13x+16 | | 8/9+2/7x=38/63 | | 2x+3/10=49/30 | | 5/6+5/7x=5/12 | | -1/2+4x=-97/2 |