If it's not what You are looking for type in the equation solver your own equation and let us solve it.
n in (-oo:+oo)
(3/4)*n-9 = 42 // - 42
(3/4)*n-42-9 = 0
3/4*n-51 = 0 // + 51
3/4*n = 51 // : 3/4
n = 51/3/4
n = 68
n = 68
| v=u^2+5as | | 43+4+-3=-19 | | 3w^2-17w+20=0 | | d-108.8=203 | | -104=8w | | 3(1p+4)=33 | | 56/8= | | 0=x+0.702 | | 16z-2(-52+12)=-5(-42+12) | | 20x+5y=-45 | | 3x^2+30=-45 | | 2+(3x)=10 | | 9x+15+12=-72 | | 44=4w-16 | | x+-5x+-10=9+2x-7 | | x-5x-10=9 | | 4x^2+9=57 | | 9a(6a-7)= | | 2t/3(t^2-64^2/3=0 | | 3x+5=-r | | 3(x+4)=x+4 | | 9x+x+-5x=30 | | 3(2x+2)-(x-6)=10 | | 33=v+19 | | 7(x-3.7)=2.8 | | 9x+x-5x=6 | | -19.28-15.5j=17.06+19.46-11j | | 16-w/4=28 | | 3x+(3)=6 | | 3(6c-1)-8=16c+3 | | (-3+5i)-(7+9i)=0 | | 3[8+2x]-6x=24 |