If it's not what You are looking for type in the equation solver your own equation and let us solve it.
c in (-oo:+oo)
(-15*c)/4 = -30 // + 30
(-15*c)/4+30 = 0
30-15/4*c = 0 // - 30
-15/4*c = -30 // : -15/4
c = -30/(-15/4)
c = 8
c = 8
| 8x=4x^2 | | 3/8=5/16+x | | -23=3p+5+o | | 40y=30x | | 21x+4x-6y/-50+3y-x^2 | | 1/8-5/8 | | 17t=1 | | 90/10=2x+3(-2x) | | -7(x+7)=4x+28 | | 9z^-4/6z^-2 | | -8n=11n+9 | | 5x+5-2x=5 | | 2x+3=7x+3 | | 5x-29=-4x+43 | | 8n=11n-9 | | 20c= | | .04x+.02(600-x)=42 | | m+14=m+14 | | 2(3x-1)+4=38 | | 6x+5=-4+5x | | 2x+2x+2x=360 | | 7/2+3x=5.64 | | 8x+2=7(x-5)+4 | | (4x^3-5x^2+6x)-(6x^2+4x+5)= | | 7/2+3x=5,9/14 | | 21+4x-6y=14 | | 2y=z+45 | | 5-7x+8+3x+5x-3=8+2*4 | | 4(6m-1)+8(m+2)=-20 | | -19m+12=(-14m)-8 | | 8y^3(7y^2-4y-1)= | | x-5/4=18/4 |