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)
(2/5)*x+(1/10)*x-((1/20)*x) = 18 // - 18
(2/5)*x+(1/10)*x-((1/20)*x)-18 = 0
(2/5)*x+(1/10)*x+(-1/20)*x-18 = 0
9/20*x-18 = 0 // + 18
9/20*x = 18 // : 9/20
x = 18/9/20
x = 40
x = 40
| 24-6x=96 | | 3x^2+5x=350 | | 1.81=x^(1/2)+1.44x | | 12(-2+3x^2)=0 | | 1.81=x^1/2+1.44x | | x*6-7=65 | | 10(x)+5(x+25)=200 | | 5y=-2x+1/5 | | x^2+21x=9.74 | | 7-(-3/2) | | 10x^7+26x^6+12x^5=0 | | 3/2*-2 | | 4x-4y-xy=02x^2+2y^2-5xy=0 | | 3/2/-2 | | 311=16t^2 | | 9x^2=43x+10 | | 15x^2-80=0 | | 7-2x=17/2 | | 420/20*8-420/20*20 | | 64y^2-6=27 | | x-(x*.10)=110 | | 150/5+50*3*80-3*5 | | -4.9x^2+4.9x+0.8=1.829 | | -4(6n+6)=-24 | | a*15/2=-5/12 | | 3x+1y=36 | | 2x+1/8-x-1/3=5/24 | | (y*0.0675)+y=4 | | 4/3a=16 | | 450/50-25+10*3+10-5 | | 9/7t=-7/3 | | 6d^2-13d+6=0 |