If it's not what You are looking for type in the equation solver your own equation and let us solve it.
w in (-oo:+oo)
w/3 = 7 // - 7
w/3-7 = 0
1/3*w-7 = 0 // + 7
1/3*w = 7 // : 1/3
w = 7/1/3
w = 21
w = 21
| n+9=16 | | 3+n=1 | | t-4=-6 | | 5=k+1 | | 6+d=17 | | 6x+8=-3+-10 | | 3+t=0 | | k/-7=5 | | 20=n+8 | | -2a=6 | | 10=b+1 | | t-5=-16 | | -2b=12 | | 20=.5x(2x+2) | | -16=-4/5u | | -3=a-10 | | b-8=-4 | | b-2=7 | | 1=n-3 | | m/-3=-4 | | b-6=-17 | | d+1=6 | | a+9=18 | | -5=k-10 | | -11=t-2 | | -4+w=1 | | k-10=-7 | | -3+x=4 | | 6=n-2 | | 4=m-8 | | b+4=-6 | | d+8=18 |