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)
x/15 = 28/20 // - 28/20
x/15-(28/20) = 0
x/15-7/5 = 0
1/15*x-7/5 = 0 // + 7/5
1/15*x = 7/5 // : 1/15
x = 7/5/1/15
x = 21
x = 21
| (6y+6)+(3y+2y+3)=75 | | 6v(11v+5)=0 | | -4+6x-5x=8 | | f(x)=2x^2+8x | | 4-x=x^2-6x+10 | | x^3+y^3=38xy | | 83.502+3.876r=152 | | -5=7n-8-4 | | x/8-5=-20 | | 2x^4-5x^2-2=0 | | 12x^5/4x^4 | | 10x+(9+10)=15x-5 | | 20x^(1/2) | | 10x+(9+10)=15-5 | | 64.977+3.144h=152 | | x-12=x+x+8 | | 2/7-2/5 | | x-12=x+x+x+8 | | 4p+7=2p+-5 | | 6=3x+x+6 | | 72.572+2.533t=152 | | 210+0.15x=303 | | -4ksquared-8k-3=-3-5ksquared | | 12=1.5p | | -16t^2+65t+3=0 | | 8y+(-6x)-5x+1-3y+7= | | 3.2-7.4=7.4+3.6 | | 2*1-0=6 | | 30+5y=20 | | 32=6t-4 | | 19+1.50d=15+2.75d | | (3x+31)=(5x-27) |