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)
10.2/8.4 = x/7 // - x/7
10.2/8.4-(x/7) = 0
1.21428571-1/7*x = 0 // - 1.21428571
-1/7*x = -1.21428571 // : -1/7
x = -1.21428571/(-1/7)
x = 8.50000014
x = 8.50000014
| 9x+10=91 | | 12y=6y+5 | | 5t-4=3+6 | | 4x+114=-112-10x | | -4(3-8x)+5x=7x-(x-3) | | n^2-n-30=0 | | g(x)=(x+10)2+9 | | 7-1x=2x | | 3y-2x-3y+7= | | g(x)=(x+19)2 | | 4-wx=vx+1 | | 2(m+1)+3=(m-2)5 | | 7-4x+10x=-3x+10 | | 5y-1=19 | | p^3-9p^2=0 | | (5x-4)(4x-7)= | | 2p+4q=44 | | q=5m-5u | | 30a-19a=63 | | 0.045/(-9) | | 5/0.005 | | 7x^2+14x+35=3815 | | 4x+23=14x+87 | | 6x+7=8x+1 | | 4x+23=3x+3 | | -2x(5x-2)=0 | | 6x+30-2x-8=4x-16+20+6x | | 3(.6+2n)-3.2=7.2 | | 2x/5-1=5 | | 1.4x=8.4 | | 5x^2-13x-6/9-x^2 | | x/4=x+21/7 |