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)
a/4 = -7 // + 7
a/4+7 = 0
1/4*a+7 = 0 // - 7
1/4*a = -7 // : 1/4
a = -7/1/4
a = -28
a = -28
| n-2=-5/4 | | 49/9=k+4/9 | | m+1=11/8 | | b/-5=6 | | -4/7+b=-60/7 | | b/-2=4 | | 2/5n=12/5 | | m+6=71/12 | | -5n=-60 | | m/6=7 | | w+3/4=47/4 | | d+1=-9 | | m+7=81/11 | | w+4=23/7 | | -1/2n=-6 | | 7d=49/12 | | -1/2x=-4 | | x+1=-7 | | b-9=-33/4 | | 1/6x=-1/22 | | m-1/5=-26/5 | | a+4=-2 | | 87/11=a+7 | | 3x^3+x^2-20x=0 | | 36/5=t+1/5 | | n-9=-29/3 | | 46/11=x+4 | | 4/9+d=1 | | 1/9+d=-61/99 | | 2/7d=-9/35 | | b-5/6=55/6 | | -1/2m=1/12 |