If it's not what You are looking for type in the equation solver your own equation and let us solve it.
m in (-oo:+oo)
(2/7)*(42-m)+2*(m-34) = 88 // - 88
(2/7)*(42-m)+2*(m-34)-88 = 0
2/7*(42-m)+2*(m-34)-88 = 0
2/7*(42-m)+2*(m-34)-88 = 0
12/7*m-88-56 = 0
12/7*m-144 = 0
12/7*m-144 = 0
12/7*m-144 = 0 // + 144
12/7*m = 144 // : 12/7
m = 144/12/7
m = 84
m = 84
| x^2+4x+21= | | p/-5+6/1=5 | | 1898=x(6592) | | 6x=12-4y | | 3t+3(1-y)-y=-6 | | 7/20=x/100 | | 2=w/2 | | 95-2x=7-9x | | -3(-4+2z)=7z | | 512=x(6592) | | -3(12+6z)=7z | | 3z-8=-19 | | (2x-1)+(4x-3)= | | 6=a-23/8 | | 4(x-3)=x+x+8 | | 3060=x(6592) | | 2p^2-5p+8=7 | | x(fraction)8=12 | | 25=4s+4 | | -6=-(1+w) | | 0.16x+4.2=3.7 | | X-3=x(8+x) | | 4.9t^2+55+12=4.5 | | x-y^2+6y+11=0 | | 1+w/-1 | | 4.9t^2+55+12=0 | | 9/4=t/3 | | x/16-3/8x=5/16 | | 720/(-36) | | 5(y-5)+3(y+3)=40 | | 10/1.2 | | (3x^2+13x+15)/(X+2) |