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)
(10/4)*x = 21 // - 21
(10/4)*x-21 = 0
5/2*x-21 = 0 // + 21
5/2*x = 21 // : 5/2
x = 21/5/2
x = 42/5
x = 42/5
| 5x+4x-7x=40+10 | | 5x+4x=40+10 | | (1/2)w-1=(3/2)w | | In(5/(7x^7)y) | | 3t/2t-4 | | f(x)=(3x-4)/5 | | 2/3x=9/4x | | 5x-13=7x-12 | | 11w-(2-4w)=13+3(w-1) | | y=-2(1)/6 | | 11w-(12-4w)=13+2(w-1) | | 490t=100+t^2 | | 7x-16=5(2x+3)+2 | | 7x=-4x-6 | | 5y+3=6y-2 | | 2x^2+2y^2+8x-12y+2=0 | | 2(h+1)=5h+1 | | -4(5x-3)=7(-2x/6) | | 2(m-23)+4(m-3)=50 | | 2/3×10=-12 | | 10x=4x-3 | | 6x+13+3x-18+2x+9=180 | | 6-2(x-2)=-8 | | 4K+8=-10+k | | X*3=3x+13 | | -5=.25(4+20c)-8c | | 60=30-48t | | 13-(2/3)x=5 | | A/3t4=6 | | -2(5n-2)=12 | | -6a+3=-3 | | 27x+4y=193 |