If it's not what You are looking for type in the equation solver your own equation and let us solve it.
7/8/30=4.2/n=
We move all terms to the left:
7/8/30-(4.2/n)=0
We can not solve this equation
| r+0.8=7.8 | | 5(3+4x)-6(7x-5)=2x+1 | | 11+21=-4(2x-8) | | 5/6-3x/4=x/2 | | 2x+8x+4=0 | | -2x+225=3x+50 | | -4x+2=20 | | -8n+14=7n-12 | | 7.5/2.7=x/3.8= | | 3x/2=x/4+1 | | -13n+16=12-3 | | 9y-35=55 | | 6/2=48/x= | | 5y-7y+10=0 | | -2x+1=22 | | 9y-35=125 | | 3x/2=1-x/2 | | 5^n+1=175 | | 15=4^x | | x/3-3=5-2x/3 | | 2.5/x=2/3.4 | | .132x^2+6.5=0 | | 12x2+40x+8=0 | | 3x-7(-1)=-17 | | 2x/3=12+2x/7 | | 64x2+128x+20=0 | | 24x+4x-5x= | | -16x^2+30x+10=0 | | x/2=2-3x/2 | | -8a-15-4a=9= | | 10e+2=7e+14 | | 3/16x+9/8=1/8x |