If it's not what You are looking for type in the equation solver your own equation and let us solve it.
k in (-oo:+oo)
7*k+1 = 64 // - 64
7*k-64+1 = 0
7*k-63 = 0 // + 63
7*k = 63 // : 7
k = 63/7
k = 9
k = 9
| 1+2a=7/5 | | 1-1/3w=5/6 | | 2/3a+3/4=-13/4 | | -3/5-6w=-79/15 | | 2/5b+5/7=18/35 | | 3y^2-3y^3-6y^2+7y^2= | | 1/3m+5/9=11/9 | | -3/4n-9=-129/14 | | -5n-2/9=448/9 | | 3/7a+3/8=153/280 | | -6+5/7x=-49/9 | | -6d+7/10=727/10 | | -15c/-4=-30 | | 4/7x+2/3=134/21 | | 2/3-5/6n=9 | | 5/6t+10=65/6 | | 7+5m=79/7 | | 2/5x+4/5=8/7 | | 1/3t-3/7=-11/42 | | 6-5a=66 | | 19+3(2n-10)=1 | | 5a+3/5=-72/5 | | -1/2+7b=7/2 | | -7a-4=-8 | | 2n+2/7=114/7 | | 3d-4=5 | | 4/5+5a=-96/5 | | 6-2k=-16 | | x^4-x^2+30=0 | | 5/7d-1/3=83/21 | | 3/4b+3/8=21/8 | | m+6/7=25/21 |