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)
(4/5)*k = 4/7 // - 4/7
(4/5)*k-(4/7) = 0
(4/5)*k-4/7 = 0
4/5*k-4/7 = 0 // + 4/7
4/5*k = 4/7 // : 4/5
k = 4/7/4/5
k = 5/7
k = 5/7
| 4/9×36 | | X-(90-63)=58 | | X/3000=76155.24 | | X*3000=76155 | | x^2-4x+4800=0 | | -19=4[x+5]+9x | | B=2acd | | 18=6-8x+5x | | 4u^2+4u-74=0 | | c^5-8=-2 | | 26.1+b=54.6 | | 17.4+b=54.6 | | (x-1/2)-(3x-1/4)=3/4 | | 4x+(20-17)=23 | | 4k-22=37k | | 5x+6x-9x=4+4 | | 8.7+b=54.6 | | (X-4)(x)(x+16)=768 | | -2(-4x+2)-3(3x-1)=-7x | | 14/7x2 | | (3)(4x)+(3)(8)+8x=160-(2)(5x) | | X=60/(1/3) | | 12x-8=3x+10 | | 85x+23=321 | | -5+7x-7x+6x=40 | | 0x^2+bx+c=0 | | 8-8x+9x+8=31 | | 2x+2+6x+5=52 | | 13(d-6)+8=-5 | | 3x+7x+8+1=38 | | 2.87/2 | | -5c-13=-68 |