If it's not what You are looking for type in the equation solver your own equation and let us solve it.
a in (-oo:+oo)
(7/8)*a = -42 // + 42
(7/8)*a+42 = 0
7/8*a+42 = 0 // - 42
7/8*a = -42 // : 7/8
a = -42/7/8
a = -48
a = -48
| R^2-5r=-4 | | Q/7=1.2 | | 2.4m-11=-8.2 | | 3x+6+3x+6=7x+1 | | 24(x+1)=6(4x-2)+36 | | 9t^4+t^4= | | 9t^4+t^4= | | 9t^4+t^4= | | 8x+4y^3=0 | | 8x+4y^3=0 | | -3.5+9.1= | | -9x=9x-12 | | -3.5x+9.1= | | 15x-6=84 | | 11k-7k-2k-k-1=46 | | 3/4x3=? | | 19r+2r-r-18r+2=20 | | 30=21x | | 5/x-1=10 | | 45g-20g+3g-24g-3g=29 | | 2p=15+5p | | -10+32=0 | | 18y=14 | | 3x(-0.04)= | | 7j+5j-7j-4j=10 | | 3x(-0.4)= | | 5=10*ln(h-80) | | log(7)(x^2)=log(7)(3x+10) | | -6n/3=36 | | 9p-7p+5p-3=18 | | x(.05)=814.80 | | X^2-91x-900=0 |