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)
4*m+2 = 42 // - 42
4*m-42+2 = 0
4*m-40 = 0 // + 40
4*m = 40 // : 4
m = 40/4
m = 10
m = 10
| 3+2d=7 | | 6+5n=46 | | 7-6b=-35 | | 4w-10=-54 | | -7+5w=13 | | -6a-10=14 | | -3+7t=-3 | | -4b+8=-8 | | -10-7k=25 | | 4d+3=43 | | 5b-4=51 | | 12(2x-8)=3(8x+7) | | 1-6b=-11 | | 3b-1=-13 | | 9/10z=3/8 | | 2+7a=2 | | -6d+3=-33 | | 2-4a=-38 | | 7+3n=10 | | 8+15m-7=9m+61-6m | | 3x^3+7y=18 | | 2+6a=-4 | | 4/5w=2/3 | | -3+7k=32 | | 3+5w=23 | | 6b-7=41 | | 7a+9=86 | | 6b-6=18 | | -6-2w=-2 | | 2k-1=-15 | | -7+6k=47 | | -10+2m=6 |